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<!-- Generated by DataTracks version 1.1.9 on 31-Oct-2017 [04:40:39] {PM} EST - www.datatracks.com -->
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        <link:definition>101 - Document - Document And Entity Information</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.myrgroup.com/role/ConsolidatedBalanceSheets" id="ConsolidatedBalanceSheets">
        <link:definition>102 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>

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        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.myrgroup.com/role/ConsolidatedBalanceSheetsParenthetical" id="ConsolidatedBalanceSheetsParenthetical">
        <link:definition>103 - Statement - CONSOLIDATED BALANCE SHEETS [Parenthetical]</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>104 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

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        <link:definition>105 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

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      <link:roleType roleURI="http://www.myrgroup.com/role/OrganizationBusinessAndBasisOfPresentation" id="OrganizationBusinessAndBasisOfPresentation">
        <link:definition>106 - Disclosure - Organization, Business and Basis of Presentation</link:definition>

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        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.myrgroup.com/role/Acquisition" id="Acquisition">
        <link:definition>107 - Disclosure - Acquisition</link:definition>

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        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>108 - Disclosure - Fair Value Measurements</link:definition>

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        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.myrgroup.com/role/ContractsInProcess" id="ContractsInProcess">
        <link:definition>109 - Disclosure - Contracts in Process</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.myrgroup.com/role/Debt" id="Debt">
        <link:definition>110 - Disclosure - Debt</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.myrgroup.com/role/IncomeTaxes" id="IncomeTaxes">
        <link:definition>111 - Disclosure - Income Taxes</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.myrgroup.com/role/CommitmentsAndContingencies" id="CommitmentsAndContingencies">
        <link:definition>112 - Disclosure - Commitments and Contingencies</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.myrgroup.com/role/LeaseObligations" id="LeaseObligations">
        <link:definition>113 - Disclosure - Lease Obligations</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/StockbasedCompensation" id="StockbasedCompensation">
        <link:definition>114 - Disclosure - Stock-Based Compensation</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/SegmentInformation" id="SegmentInformation">
        <link:definition>115 - Disclosure - Segment Information</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/EarningsPerShare" id="EarningsPerShare">
        <link:definition>116 - Disclosure - Earnings Per Share</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.myrgroup.com/role/OrganizationBusinessAndBasisOfPresentationPolicies" id="OrganizationBusinessAndBasisOfPresentationPolicies">
        <link:definition>117 - Disclosure - Organization, Business and Basis of Presentation (Policies)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/AcquisitionTables" id="AcquisitionTables">
        <link:definition>118 - Disclosure - Acquisition (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/ContractsInProcessTables" id="ContractsInProcessTables">
        <link:definition>119 - Disclosure - Contracts in Process (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/LeaseObligationsTables" id="LeaseObligationsTables">
        <link:definition>120 - Disclosure - Lease Obligations (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/SegmentInformationTables" id="SegmentInformationTables">
        <link:definition>121 - Disclosure - Segment Information (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/EarningsPerShareTables" id="EarningsPerShareTables">
        <link:definition>122 - Disclosure - Earnings Per Share (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/OrganizationBusinessAndBasisOfPresentationDetailsTextual" id="OrganizationBusinessAndBasisOfPresentationDetailsTextual">
        <link:definition>123 - Disclosure - Organization, Business and Basis of Presentation (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/AcquisitionDetails" id="AcquisitionDetails">
        <link:definition>124 - Disclosure - Acquisition (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/AcquisitionDetailsTextual" id="AcquisitionDetailsTextual">
        <link:definition>125 - Disclosure - Acquisition (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/ContractsInProcessDetails" id="ContractsInProcessDetails">
        <link:definition>126 - Disclosure - Contracts in Process (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.myrgroup.com/role/ContractsInProcessDetails1" id="ContractsInProcessDetails1">
        <link:definition>127 - Disclosure - Contracts in Process (Details 1)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/DebtDetailsTextual" id="DebtDetailsTextual">
        <link:definition>128 - Disclosure - Debt (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/IncomeTaxesDetailsTextual" id="IncomeTaxesDetailsTextual">
        <link:definition>129 - Disclosure - Income Taxes (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/CommitmentsAndContingenciesDetailsTextual" id="CommitmentsAndContingenciesDetailsTextual">
        <link:definition>130 - Disclosure - Commitments and Contingencies (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/LeaseObligationsDetails" id="LeaseObligationsDetails">
        <link:definition>131 - Disclosure - Lease Obligations (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/LeaseObligationsDetailsTextual" id="LeaseObligationsDetailsTextual">
        <link:definition>132 - Disclosure - Lease Obligations (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/StockbasedCompensationDetailsTextual" id="StockbasedCompensationDetailsTextual">
        <link:definition>133 - Disclosure - Stock-Based Compensation (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/SegmentInformationDetails" id="SegmentInformationDetails">
        <link:definition>134 - Disclosure - Segment Information (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/SegmentInformationDetailsTextual" id="SegmentInformationDetailsTextual">
        <link:definition>135 - Disclosure - Segment Information (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/EarningsPerShareDetails" id="EarningsPerShareDetails">
        <link:definition>136 - Disclosure - Earnings Per Share (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/EarningsPerShareDetails1" id="EarningsPerShareDetails1">
        <link:definition>137 - Disclosure - Earnings Per Share (Details 1)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.myrgroup.com/role/EarningsPerShareDetailsTextual" id="EarningsPerShareDetailsTextual">
        <link:definition>138 - Disclosure - Earnings Per Share (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

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      <link:linkbaseRef xlink:type="simple" xlink:href="myrg-20170930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />

      <link:linkbaseRef xlink:type="simple" xlink:href="myrg-20170930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />

      <link:linkbaseRef xlink:type="simple" xlink:href="myrg-20170930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
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  <element name="DebtInstrumentCovenantInterestCoverageRatio" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_DebtInstrumentCovenantInterestCoverageRatio" />

  <element name="LossContingencyInsurancePolicyDeductibleForEachLineOfCoverageExcludingHealth" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="myrg_LossContingencyInsurancePolicyDeductibleForEachLineOfCoverageExcludingHealth" />

  <element name="LossContingencyHealthInsuranceDeductibleForQualifiedIndividuals" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="myrg_LossContingencyHealthInsuranceDeductibleForQualifiedIndividuals" />

  <element name="OutstandingPerformanceBonds" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="myrg_OutstandingPerformanceBonds" />

  <element name="EstimatedCostToCompleteBondedProjects" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="myrg_EstimatedCostToCompleteBondedProjects" />

  <element name="LongtermIncentivePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_LongtermIncentivePlanMember" />

  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPotentialPayoutAsPercentageOfTargetShares" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPotentialPayoutAsPercentageOfTargetShares" />

  <element name="EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsAbstract" />

  <element name="EstimateAdjustmentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_EstimateAdjustmentMember" />

  <element name="ShareRepurchaseProgramMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_ShareRepurchaseProgramMember" />

  <element name="FinancialStatementsAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="myrg_FinancialStatementsAxis" />

  <element name="FinancialStatementsDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_FinancialStatementsDomain" />

  <element name="ConsolidatedBalanceSheetMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_ConsolidatedBalanceSheetMember" />

  <element name="BusinessCombinationTotalConsiderationNetOfNetAssetAdjustments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="myrg_BusinessCombinationTotalConsiderationNetOfNetAssetAdjustments" />

  <element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCostsAndEstimatedEarningsInExcessOfBillings" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="myrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCostsAndEstimatedEarningsInExcessOfBillings" />

  <element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBillingsInExcessOfCostsAndEstimatedEarnings" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" xbrli:balance="credit" substitutionGroup="xbrli:item" id="myrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBillingsInExcessOfCostsAndEstimatedEarnings" />

  <element name="RecognizedRevenuesAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="myrg_RecognizedRevenuesAxis" />

  <element name="NoncashFinancingActivitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_NoncashFinancingActivitiesAbstract" />

  <element name="CanadianOperationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_CanadianOperationMember" />

  <element name="SharesRepurchasedUnderStockCompensationProgramMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_SharesRepurchasedUnderStockCompensationProgramMember" />

  <element name="ScheduleOfFutureMinimumLeasePaymentsForCapitalAndOperatingLeasesTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_ScheduleOfFutureMinimumLeasePaymentsForCapitalAndOperatingLeasesTableTextBlock" />

  <element name="OperatingleasesfutureminimumpaymentsdueabstractAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_OperatingleasesfutureminimumpaymentsdueabstractAbstract" />

  <element name="ForeignRevolvingLoansAndLettersOfCreditMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_ForeignRevolvingLoansAndLettersOfCreditMember" />

  <element name="PerformanceLettersOfCreditMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_PerformanceLettersOfCreditMember" />

  <element name="PercentageOfCapitalStockFromDirectForeignSubsidiaries" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_PercentageOfCapitalStockFromDirectForeignSubsidiaries" />

  <element name="CreditAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_CreditAgreementMember" />

  <element name="MaximumAcquisitionConsiderationUnderCreditAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="credit" substitutionGroup="xbrli:item" id="myrg_MaximumAcquisitionConsiderationUnderCreditAgreement" />

  <element name="InsuranceProgramObligationsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_InsuranceProgramObligationsMember" />

  <element name="ContractPerformanceObligationsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_ContractPerformanceObligationsMember" />

  <element name="DebtInstrumentCovenantLeveragedDebtRatioRestriction" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_DebtInstrumentCovenantLeveragedDebtRatioRestriction" />

  <element name="AcquisitionOfPropertyUnderCapitalLeesArrangements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="credit" substitutionGroup="xbrli:item" id="myrg_AcquisitionOfPropertyUnderCapitalLeesArrangements" />

  <element name="WesternPacificEnterprisesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_WesternPacificEnterprisesMember" />

  <element name="BusinessCombinationCompensationExpensesOnContingentPayment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="myrg_BusinessCombinationCompensationExpensesOnContingentPayment" />

  <element name="MarketbasedPerformanceAwardsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_MarketbasedPerformanceAwardsMember" />

  <element name="InternalMeasurebasedPerformanceAwardsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_InternalMeasurebasedPerformanceAwardsMember" />

  <element name="LeverageCoverageRatio" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_LeverageCoverageRatio" />

  <element name="IncomeTaxesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_IncomeTaxesLineItems" />

  <element name="LeverageCoverageRatioExpansion" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_LeverageCoverageRatioExpansion" />

  <element name="RecognizedRevenuesDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_RecognizedRevenuesDomain" />

  <element name="SignificantChangeOrdersOrClaimsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_SignificantChangeOrdersOrClaimsMember" />

  <element name="OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems" />

  <element name="FacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_FacilityMember" />

  <element name="OldShareRepurchaseProgramMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_OldShareRepurchaseProgramMember" />

  <element name="NewShareRepurchaseProgramMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="myrg_NewShareRepurchaseProgramMember" />
</schema>

