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Gypsum Wash Dam Rehabilitation

Project Description

gypsum_wash_dam_photoGypsum Wash Dam is located on the southeast side of Washington City, Utah and the project sponsor is the Washington County Flood Control Authority. NRCS performed an assessment of Gypsum Wash Dam in 2006. The 2006 assessment concluded that the Gypsum Wash Dam does not meet current NRCS and Utah State Dam Safety regulations and engineering standards for a Class “C” - High Hazard Class dam (potential “Loss of Life”). The purpose of this project is for the dam to meet current NRCS and Utah State Dam Safety regulations, current engineering standards, and stabilize the existing dam structures. The life of the dam would be extended for 100 years.

NEPA Analysis

This project is being partially funded by the NRCS Small Watershed Rehabilitation Amendments (PL 106-472) which authorizes funding and technical assistance to rehabilitate aging flood control dams built under the Small Watershed Program (PL83-566).  NRCS, as the lead federal agency, initiated National Environmental Policy Act (NEPA) analysis in the form of a Supplemental Watershed Plan and Environmental Assessment (Plan-EA) to analyze potential impacts to the natural and human environment. Alternatives to rehabilitate Gypsum Wash Dam have been analyzed and the Plan-EA complies with the Council on Environmental Quality’s regulations at 40 CFR Parts 1500-1508 which require an evaluation of potential environmental impacts associated with federal projects and actions.  The Bureau of Land Management (BLM) was a Cooperating Agency on the NEPA analysis since a portion of the project is located on land managed by the BLM St. George Field Office.

Current Status

The Draft Plan-EA public comment period closed on March 13, 2015. NRCS compiled comments received and completed the Final Plan-EA for the project. The NRCS Utah State Conservationist has decided that a Finding of No Significant Impact (FONSI) is approved for the Preferred Alternative (Dam Rehabilitation).  Construction is anticipated to occur in summer 2017.

Contact Information

For further project information please contact:

Lance Smith – NRCS (Design/Construction)
125 S. State Street – Room 4010
Salt Lake City, UT 84138-1100


Norm Evenstad – NRCS (Planning)
125 S. State Street – Room 4010
Salt Lake City, UT 84138-1100

Project Documents

Utah Division of Water Rights Dam Safety – Gypsum Wash Dam Website

Finding of No Significant Impact
Gypsum Wash Dam FONSI (PDF, 844 KB)

Final Plan-EA
Gypsum Wash Dam Final Plan-EA (PDF, 47.2 MB)

Archived Material

Draft Plan-EA
Gypsum Wash Dam Draft Plan-EA Total Report (PDF, 40.2 MB)

Scoping Report (PDF, 1.58 MB)

Updated: May 6, 2016