Catwalk Reservoir Report
Nearby: Enl. Spring Cedar Gulch
Last Updated: December 5, 2025
Catwalk is a privately owned irrigation dam located in Sheridan, Wyoming, specifically in the vicinity of Gangplank Creek on an unnamed ranch.
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Summary
Designed by Hugh Lowham, this Earth-type dam stands at a height of 30 feet with a hydraulic height of 23 feet and a structural height of 31 feet. With a storage capacity of 59 acre-feet and a normal storage level of 33 acre-feet, Catwalk serves multiple purposes including fire protection, stock watering, and irrigation.
The dam, completed in an unspecified year, spans a length of 380 feet and covers a surface area of 3.79 acres with a drainage area of 1.14 square miles. Equipped with an uncontrolled spillway that is 75 feet wide, Catwalk has a low hazard potential and is in fair condition as of the last inspection in June 2019. With its moderate risk assessment, Catwalk plays a crucial role in managing water resources for agricultural activities in the region, highlighting the importance of maintaining and monitoring such structures in the face of changing climate conditions.
Overall, Catwalk represents a vital piece of infrastructure in Wyoming's water management system, contributing to the sustainability of irrigation practices in the area. As a privately owned dam, it serves as a reminder of the diverse network of water structures that support local communities and ecosystems, emphasizing the need for continued oversight and maintenance to ensure the resilience of water resources in the face of climate challenges.
Dam Length |
380 |
Dam Height |
30 |
River Or Stream |
GANGPLANK CREEK |
Primary Dam Type |
Earth |
Surface Area |
3.79 |
Hydraulic Height |
23 |
Drainage Area |
1.14 |
Nid Storage |
59 |
Structural Height |
31 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Prairie Dog Creek Near Acme
|
19cfs |
Tongue River At State Line Nr Decker Mt
|
195cfs |
Goose Creek Near Acme
|
123cfs |
Tongue River At Monarch
|
383cfs |
Tongue River At Tongue R Dam Nr Decker Mt
|
118cfs |
Piney Creek At Kearny
|
113cfs |
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.
Catwalk