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  <xsd:element id="dy_SharebasedCompensationbySharebasedPaymentAwardEquityAwardsOtherthanOptionsSupplementalSharesExpectedtobeCanceled" name="SharebasedCompensationbySharebasedPaymentAwardEquityAwardsOtherthanOptionsSupplementalSharesExpectedtobeCanceled" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="dy_SharebasedCompensationbySharebasedPaymentAwardEquityAwardsOtherthanOptionsTargetSharesExpectedtobeCanceled" name="SharebasedCompensationbySharebasedPaymentAwardEquityAwardsOtherthanOptionsTargetSharesExpectedtobeCanceled" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="dy_SubcontractorsandmaterialsexpenseMember" name="SubcontractorsandmaterialsexpenseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="dy_SupplementalSharesMember" name="SupplementalSharesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="dy_SwinglineLoansMember" name="SwinglineLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="dy_TargetSharesMember" name="TargetSharesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="dy_TelecommunicationsSpecialtyConstructionContractorCanadaMember" name="TelecommunicationsSpecialtyConstructionContractorCanadaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="dy_TradeAccountsReceivableandCostsandEstimatedEarningsMember" name="TradeAccountsReceivableandCostsandEstimatedEarningsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="dy_UtiliquestMember" name="UtiliquestMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="dy_ValueofSharesPaidforTaxWithholdingforShareBasedCompensation" name="ValueofSharesPaidforTaxWithholdingforShareBasedCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="dy_WattsBrothersCableConstructionInc.Member" name="WattsBrothersCableConstructionInc.Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
