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Survey Section 
Surveying Equipment 

The Survey Section provides surveying services and technical information to the CIP (Capital Improvement Program) Section, other City departments, citizens, and consultants. Those services include computer drafting, topographic surveys, legal descriptions, and plat reviews.

Survey Control for City of Thornton Projects

Horizontal Control

The City of Thornton does not maintain a survey network.  Please use NGS monuments and/or the Adams County Network for your control points when working on City of Thornton projects.

Vertical Control

The vertical datum must be based upon the North American Vertical Datum 1988 (NAVD 88).  You may use the City of Thornton Benchmarks, which are downloadable below, Benchmarks from NGS and the Adams County Control points.

Benchmark descriptions are now available in a downloadable pdf format.


Please note: A document on this page is in .pdf format and requires the user to have a PDF Reader installed on their computer in order to read it. If you do not have a PDF reader, you can download one for free by following this link...

Adobe Acrobat graphic link

Please contact the Engineering Services Division at 720-977-6210 if you have any questions regarding any of these programs or email

City of Thornton
9500 Civic Center Drive, Thornton, CO 80229
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