Exhibit 10.17



SECURED REVOLVING PROMISSORY NOTE







|$13,000,000.00 | March 11, 2016
|-------------- | --------------



|Maker:                    |  | Sterling Construction Company, Inc.               
|------------------------- |  | --------------------------------------------------
|                          |  |                                                   
|Holder(s):                |  | Road and Highway Builders, LLC                    
|                          |  | Myers & Sons Construction, L.P.                   
|                          |  |                                                   
|Place for Payment:        |  | 96 Glen Carran Circle, #6                         
|                          |  | Sparks, Nevada  89431                             
|                          |  |                                                   
|                          |  | 4600 Northgate Blvd.                              
|                          |  | Sacramento, CA  95834                             
|                          |  |                                                   
|Principal Amount/         |  |                                                   
|Maximum Committed Amount: |  | $13,000,000.00                                    
|                          |  | Issued as a Revolving Line of Credit              
|                          |  |                                                   
|Interest Rate:            |  | 2% above Prime Rate                               
|                          |  |                                                   
|Default Interest Rate:    |  | The lesser of (i) 4% above Prime Rate, or (ii) 18%
|                          |  |                                                   
|Maturity Date:            |  | January 2, 2018                                   



Terms:



FOR VALUE RECEIVED, Sterling Construction Company, Inc., a Delaware
corporation, whose address for purposes of this Secured Revolving Promissory Note (“Note”) is 1800 Hughes Landing,
Blvd., Suite 250, The Woodlands, TX 77380 (“Maker”) has and continues to receive cash sweep loans from Road and Highway
Builders, LLC, a Nevada limited liability company, and Myers & Sons Construction, L.P., a California limited partnership (each
a “Holder” and collectively “Holders”) pursuant and subject to the provisions of Section 9.5 of the Road
and Highway Builders, LLC Fourth Amended and Restated Operating Agreement, and all amendments and restatements thereof (collectively,
the “RHB Agreement”), and Section 8.4(a) of the Myers & Sons Construction, L.P. Second Amended and Restated Limited
Partnership Agreement, and all amendments and restatements thereof (collectively, the “Myers Agreement”). Maker promises
to pay Holders at the Place of Payment the principal sum of Thirteen Million Dollars ($13,000,000.00) or so much thereof as Holders
shall have been advanced from time to time to Maker plus interest from the date of the inception of the loan on the principal balance
from time to time outstanding at the rate of 2% above Prime Rate per annum until paid in full.



All principal outstanding on this Note shall
be paid in full in one payment on January 2, 2018 (unless such maturity date is extended by written agreement of the parties hereto).
All interest payable on sums due under this Note shall either be (i) paid to Holders on a monthly basis no later than the last
business day of the month, or (ii) added to the outstanding principal balance of this Note on such date as long as such addition
does not cause the Note amount to exceed the Maximum Committed Amount. Interest on this Note shall be computed on the basis of
a year of 365 days for the actual number of days elapsed. Any capitalized terms used herein, but not defined herein, shall have
the meaning as ascribed to such terms in the RHB Agreement or Myers Agreement, as applicable. Notwithstanding anything herein to
the contrary, the terms, conditions, rights and obligations of the parties set forth in the RHB Agreement and Myers Agreement shall
remain in full force and effect and shall not be waived or diminished in any way by the terms of this Note or any Deed of Trust.









Payment on this Note is secured by Deeds of
Trust on certain real property owned by Maker and/or its subsidiaries and affiliates. Such Deeds of Trust are attached hereto as
Exhibit A. This Note, the Deeds of Trust, the RHB Agreement and the Myers Agreement shall hereinafter be collectively referred
to as the “Loan Documents.”



The Maker may at any time and from time to time
prepay, in whole or in part, without premium or penalty, any of the principal balance.



The Note shall become immediately due and payable
without notice or demand upon the occurrence at any time of any of the following events of default (individually, “an Event
of Default” and collectively “Events of Default”):



1.	    Maker voluntarily files for bankruptcy protection or is
involuntarily placed in bankruptcy (and such involuntary petition is not dismissed within ninety (90) days of being filed);



2.	    Maker (i) agrees in writing to sell Maker
or all or substantially all of Maker’s or its subsidiaries’ assets or business interests without the Holder’s
consent (sales of securities on a nationally recognized securities market are exempt from this provision) and Maker fails to provide
for the payment in full of all proceeds toward the payment of this Note in full, or (ii) takes affirmative steps towards liquidation
of Maker;



3.	    Travelers or another surety calls any
guaranties or provides funding or payment of Maker’s accounts payable or collects or attaches contract receivables, and same
is not rescinded within thirty (30) days thereafter;



4.	    A Holder cannot meet its contractual or
legal payment requirements to subcontractors, vendors or other third party creditors which Holder would have been otherwise able
to make if this Note was not in place, and same is not cured within thirty (30) days after written notice to Maker;



5	    Maker fails to maintain any secured collateral
in good condition as required by the Deeds of Trust and such failure is not remedied within thirty (30) days after written notice
to Maker;



6.	    Maker attempts to subvert Holder’s
first priority lien on any secured real property;



7.	    Maker defaults or is in breach in any
way on the Deeds of Trust or the Note, and such default or breach continues for a period of thirty (30) days after written notice
thereof from the Holders to Maker; and/or



8.	    A sweep by Maker of a Holder’s cash
causes the total debt owed hereunder to exceed the Maximum Committed Amount which was not consented to by the applicable Holder
hereunder, and such debt is not reduced within thirty (30) days after receipt of notice from a Holder of a default under this provision.



Upon the occurrence of an Event of Default,
Holders shall have then, or at any time thereafter, all of the rights and remedies afforded a secured creditor by the Uniform Commercial
Code as from time to time in effect in the State of Texas or provided for in the Loan Documents or under applicable law. Notwithstanding
anything herein to the contrary, the amount outstanding under this Note shall be determined once Maker closes its book in the normal
course of business at the end of each month.









From the date of the execution of this Note,
Maker shall have ninety (90) days to cause the outstanding principal amount of this Note to be equal to or less than the value
of all of the collateral securing this Note. In the event that Maker fails to do this within the allotted time frame, Maker will
be in default on this Note. The value of the following real estate collateral shall be $12,200,000.00, unless otherwise mutually
agreed upon by Maker and Holder: (i) 5638 FM 1346, San Antonio, Texas 78220; (ii) St. Hedwig Rd., San Antonio, Texas 78220; (iii)
3475 High River Rd., Fort Worth, Texas 76155; and (iv) 20800 Fernbush Ln., Houston, Texas 77073.



Maker agrees to pay on demand all costs of collection,
including without limitation reasonable attorney’s fees, incurred by Holder in connection with any action taken to enforce
the terms of this Note.



No delay or omission on the part of the Holders
in exercising any right under this Note or the Loan Documents shall operate as a waiver of such right of any other right of Holders,
nor shall any delay, omission or waiver on any one accession be deemed a bar or waiver of the same or any other right on any future
occasion. The Maker regardless of the time, order or place of signing waives presentment, demand, protest or notice of any every
kind, except as specifically required herein.



If any amounts under this Note become due and
payable on a Saturday or Sunday or a day on which banks in the State of Texas are authorized by law to remain closed, such amount
shall be paid on the next succeeding day that such banks are open for business.



Payments of principal and interest shall be
made to the Holders hereof in such coin or currency of the United States of America as at the time of payment shall be legal tender
for the payment of private debts at the offices of Holders.



This Note is intended to memorialize the loan
agreements between the parties set forth in the RHB Agreement and the Myers Agreement. Nothing herein shall be construed as a modification
or waiver of the rights and remedies of Maker, Holders, or any other party contained in such agreements, or any future amendments
or modifications of such agreements, and all rights and remedies contained in such agreements shall remain in full force and effect.
To the extent necessary, this Note memorializes and replaces any other notes or loan agreements between the parties.



All rights and obligations hereunder shall be
governed by the laws of the State of Texas. Venue for any dispute relating this this Note or any other Loan Document shall lie
in the State District Courts of Tarrant County, Texas.



IN WITNESS WHEROF, Maker has caused this Secured
Revolving Promissory Note to be executed as of the date set forth above.





| | MAKER                                   
| | ----------------------------------------
| |                                         
| | Sterling Construction Company,
    Inc.,
| | a Delaware corporation:                 
| | By:  ________________________           
| |                                         
| | Print Name: __________________          
| |                                         
| | Its:  _________________________         













SIGNED AND SWORN TO BEFORE ME, the undersigned
authority, on this _____ day of March, 2016.





| | ______________________________
| | ------------------------------
| | Notary Public                 
| | State of _______________