66 Pastures Reservoir Report
Nearby: Hawk Springs Mcmillen No. 2
Last Updated: December 5, 2025
66 Pastures is a privately-owned irrigation dam located in Goshen County, Wyoming, along the Horse Creek Offstream.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1910, this earth dam stands at a height of 16 feet and has a capacity of 1141 acre-feet for storing water for irrigation purposes. With a surface area of 82 acres and a drainage area of 0, the dam has a spillway width of 14 feet and is equipped with a valve outlet gate.
Despite its age, the dam at 66 Pastures is in fair condition, with a low hazard potential. Regular inspections have been conducted, with the last assessment performed in May 2017. The dam's risk assessment is classified as moderate, indicating the need for ongoing risk management measures. The surrounding area is represented by Liz Cheney, a Republican member of Congress from Wyoming.
Water resource and climate enthusiasts will appreciate the historical significance and functional importance of 66 Pastures in sustaining agricultural activities in the region. As a key infrastructure for irrigation, this dam plays a vital role in supporting local farming operations and ensuring water availability for crops. The dam's design and construction reflect early 20th-century engineering practices, highlighting the ingenuity and resourcefulness of past generations in harnessing water resources for agricultural development.
Year Completed |
1910 |
Dam Length |
6500 |
Dam Height |
16 |
River Or Stream |
HORSE CREEK OFFSTREAM |
Primary Dam Type |
Earth |
Surface Area |
82 |
Hydraulic Height |
14 |
Nid Storage |
1141 |
Structural Height |
16 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
66 Pastures