Forgot password?  


Welcome to the PLSC Website!

PLSC is dedicated to the improvement of land surveying education and practice. We encourage land surveying professionals and individuals interested in our profession to participate in our upcoming events, visit our Chapter websites and get involved! This is a great profession, and PLSC is here to support the profession to continually improve the practice within Colorado.

Need a Land Surveyor?

PLSC cannot recommend one surveyor over another. If you need a land surveyor, please review a list of our members under our membership tab or go to the Colorado Department of Regulatory Agencies (DORA) and download the list of Colorado licensed surveyors and also check for any disciplinary actions against a particular surveyor under the "Verify License Tab" on the DORA site. Certified Federal Surveyors are listed at Be sure to check references for the surveyor you are considering hiring.


NGS Video Release
Posted October 15, 2014

Thursday, Oct. 9 - NGS releases video explaining difference between 'precision' and 'accuracy' in geodetic surveying NSPS The National Geodetic Survey (NGS) has just released a new (approximately two-minute) video focusing on the importance of both precision and accuracy in geodetic surveying and the difference between the two terms. Produced as a collaborative effort between NGS and The COMET® Program, the video is designed for surveying professionals, planners, policy-makers, and others who use mapping products.This resource is hosted on COMET's YouTube Channel. COMET is a world-wide leader in support of education and training for the environmental sciences. The video emphasizes that the accuracy of survey measurements should always be verified by relating measurements to a known reference system, such as the National Spatial Reference System (NSRS) in the United States. NGS defines, maintains, and provides access to theNSRS, the consistent coordinate system that defines latitude, longitude, height, scale, gravity, and orientation throughout the United States and is designed to meet our nation's economic, social, and environmental needs.Watch the video today on YouTube.For more information, contact:


Highline CBL Notice of Construction
Posted February 24, 2014

CDOT has an active construction project underway at the Highline CBL located at Tower Road and I-70rendering it unusable.Please do not attempt to access this baseline until further notice.To locate another CBL please refer to:


Want to Become a Certified Federal Surveryor?
Posted March 28, 2013

Co-administered by the Department of the Interior's Bureau of Land Management and the National Society of Professional Surveyors (NSPS), the Program provides extensive training for Professional Land Surveyors in dealing with federal survey processes.


Classified Ads

TitleEmployerPost Date
Land Surveyor Party Chief 09/25/14
Land Surveyor Technician 09/25/14
Project Surveyor/Land Surveyor 09/25/14
Survey Sales SpecialistGeoShack North America, Inc.09/29/14
Surveying TechnicianCity & County of Denver10/22/14
Transporation SurveyorCalifornia Department of Transportation09/08/14


Member Spotlight

PLSC would like to introduce you to our members. If you would like to submit your photo and information for a future Spotlight, email the information to

Dennis Shellhorn, PLS, a founder and past principal of River City Consultants, has been in the surveying profession since 1975 and licensed in Colorado since 1981.  He has been involved in a wide range of surveying projects including mining, highway construction, residential development, cadastral surveying for the U.S. Forest Service, GPS control surveying, boundary surveying and extensive design and topographic surveys in that time. 
Among his memorable projects is the French Creek Tunnel on I-70 in Glenwood Canyon. Dennis was the Project Surveyor for the highway tunnel and six other major phases of the Glenwood Canyon I-70 over a period of eight years. He relocated to Grand Junction where he managed crews and performed surveys for highway and airport construction, residential subdivisions and most enjoyably cadastral surveys for the Forest Service.
Colorado companies that have enjoyed Dennis’ expertise and professionalism include Armstrong Associates, Western States Surveying, Thompson-Langford Corporation and of course River City Consultants from which Dennis retired in December 2012. He seems to have settled well into retirement although he is still helping out at River City when his special talents are needed.
Dennis is an avid golfer, outdoorsman, fisherman and hunter and has enjoyed the first few months of full retirement golfing and doing some fishing.  Bird hunting season is just around the corner and Dennis has been helping out at a local hunting club. His participation there resulted in being featured last year on the cover of the Orvis hunting catalog.

PLSC would like to thank our Sustaining Members and Sponsors:

  Encompass Services, LLC
 PWSI Land Surveyors
SKLD Information Svcs.
Professional Land Surveyors of Colorado
PO Box 460022
Denver, Co 80246
Phone - (303) 551-3266 Fax - (720) 230-4846
Website designed by Vieth Consulting
Follow us on Twitter

Check out our chapters:
Central Colorado Professional Surveyors | Colorado Spatial Reference Network | Northern Chapter - PLSC | Northwest 1/4 Colorado Land SurveyorsSouthern Chapter Professional Land Surveyors | Southwestern Chapter - PLSC, Inc. | Western Colorado Land Surveyors