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  <element id="myrg_EquipmentNoteFourMember" name="EquipmentNoteFourMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_EquipmentNoteFiveMember" name="EquipmentNoteFiveMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_EarningsPerShareTable" name="EarningsPerShareTable" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_TimeVestedStockAwardsMember" name="TimeVestedStockAwardsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_EquipmentNoteSixMember" name="EquipmentNoteSixMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_EquipmentNoteSevenMember" name="EquipmentNoteSevenMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_CsiElectricalContractorsIncMember" name="CsiElectricalContractorsIncMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_ScheduleOfContractorsTable" name="ScheduleOfContractorsTable" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_ContractorsLineItems" name="ContractorsLineItems" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_ScheduleOfOperatingAndFinanceLeasesDisclosureTable" name="ScheduleOfOperatingAndFinanceLeasesDisclosureTable" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_OperatingAndFinanceLeasesLineItems" name="OperatingAndFinanceLeasesLineItems" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_PurchaseCommitmentRemainingTerm" name="PurchaseCommitmentRemainingTerm" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_DebtInstrumentRestrictedMaximumLiquidity" name="DebtInstrumentRestrictedMaximumLiquidity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_EquipmentNoteEightMember" name="EquipmentNoteEightMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_EquipmentNoteNineMember" name="EquipmentNoteNineMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_LeaseLiabilityPaymentsDueAfterYearSix" name="LeaseLiabilityPaymentsDueAfterYearSix" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearSix" name="LesseeOperatingLeaseLiabilityPaymentsDueAfterYearSix" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_LineOfCreditFacilityMaximumBorrowingCapacityNumberOfTimesNotToExceedConsolidatedEbitda" name="LineOfCreditFacilityMaximumBorrowingCapacityNumberOfTimesNotToExceedConsolidatedEbitda" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAverageTradingDays" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAverageTradingDays" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_LeaseLiabilityPaymentsDueNextTwelveMonths" name="LeaseLiabilityPaymentsDueNextTwelveMonths" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="myrg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAverageClosingStockPrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAverageClosingStockPrice" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>
