Guernsey Dam

Overview

One hundred eighty miles below Alcova Dam and 25 miles below Glendo Dam, the Guernsey Dam controls river flow. Water released from Pathfinder Reservoir can be stored and released to fit varying irrigation demands. Water is released through the Guernsey Powerplant.

Guernsey Dam is in a rocky canyon 2 miles upstream from Guernsey, Wyo. It is a diaphragm-type embankment of sluiced clay, sand and gravel that forms an impervious core. Its slopes are protected by a thick layer of rock riprap. The structural height of the dam is 135 feet. The original capacity of the reservoir was 73,810 acre-feet, but this has been greatly reduced by silt deposits. The powerplant is on the right bank below the dam and has two 2,400-kilowatt generators. Power is transmitted to towns and industries down the valley over project and other interconnected transmission system lines.


General
RegionFacilities in Great Plains | Great Plains Home Page
StateWyoming
CountyPlatte
ProjectNorth Platte
Dam Type
ReservoirGuernsey
WatercourseNorth Platte River
Location
Longitude-104.7631
Latitude42.2903
Net Generation12,108,622 kWh
Original Construction1925-1927
Modified Construction
National ID NumberWY01293
Hydrologic Unit Code

Dimensions
Structural Height135.0 ft
Hydraulic Height (Normal Operating Depth at Dam)92.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation
Crest Elevation4430.0 ft
Crest Length560.0 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)4420.0 ft
Top of Inactive Conservation Pool (Elevation)4370.0 ft
Top of Dead Storage Pool (Elevation)

Hydraulics & Hydrology
Volume
Total Water Storage at Elevation
Maximum Water Surface Elevation
Normal Water Surface Elevation4420.0 ft
Spillway Type
Auxiliary SpillwayNo
Spillway Capacity at Elevation52000.0 cfs at 4420.0 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation
Diversion Capacity at Elevation
Drainage Area2145.0 sq mi
Hydrometeorological Report (HMR)HMR
Probable Maximum Flood (PMF) Report

Contact Information
Owner
TitleFacility Manager
OrganizationNorth Platte Projects Field Office
Address22122 Kortes Road
CityAlcova, WY 82620
Phone (Office)307-261-5960
Operator
TitleFacility Manager
OrganizationNorth Platte Projects Field Office
Address22122 Kortes Road
CityAlcova, WY 82620
Phone (Office)307-261-5960


Last updated: Mar 29, 2013