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Gypsum Wash Dam Rehabilitation

Project Description

Gypsum Wash Dam is located on the southeast side of Washington City, Utah.  USDA-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” 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 a minimum of 50 years and a maximum of 100 years.  The project sponsor is the Washington County Flood Control Authority.

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, is initiating National Environmental Policy Act (NEPA) analysis in the form of a Supplemental Watershed Plan and Environmental Assessment (Plan-EA) to analyze impacts to the natural and human environment from this project.  The Environmental Assessment will comply 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.  BLM is a Cooperating Agency on the NEPA analysis since a portion of the project is located on land management by the BLM St. George Field Office.

Current Status

The project is in the Draft Plan-EA review period and the public/agencies are invited to provide comments on the proposed project.

Public Comment Period

Open:  Thursday, February 12, 2015
Close:  Friday, March 13, 2015

Public Open House

Date:   Thursday, February 26, 2015
Time:   5:00 p.m. – 7:00 p.m.
Place:  Washington City Public Works
            1305 Washington Dam Rd
            Washington City, UT

Hard copies may be viewed at:
Washington City Library - 220 N 300 E, Washington City, UT
Washington City Public Works (address listed above)

Contact Information

For further project information please contact:

Greg Allington – McMillen, LLC
1401 Shoreline Drive
Boise, ID  83702
208.342.4214 phone
208.342.4216 fax


Norm Evenstad – NRCS
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

Draft Plan-EA

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


Scoping Report (PDF, 1.58 MB)
Scoping Notice (PDF, 344 KB)
Scoping Project (PDF, 202 KB)
Scoping Public Meeting Presentation (PDF, 202 KB)

NOTE:  USDA-NRCS will add other directories and documents as we move through subsequent phases of the NEPA process.

Updated: February 12, 2015