Ulman No. 1 Reservoir Report

Last Updated: December 5, 2025

Ulman No.


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Summary

1, located in Laramie, Wyoming, is a private irrigation dam on Crow Creek with a primary purpose of providing water for agricultural needs. Built in 1970 by designer Phillip Kelly, this Earth-type structure stands at a height of 22 feet and spans 1200 feet in length. With a storage capacity of 614 acre-feet and a spillway width of 184 feet, the dam serves as a vital resource for the region, offering fire protection, stock watering, and small fish pond benefits in addition to irrigation.

Despite its low hazard potential and fair condition assessment, Ulman No. 1 is subject to state regulations and inspections to ensure its continued safety and functionality. With a moderate risk assessment rating, emergency action preparedness and risk management measures are crucial components to consider for this essential water resource. The dam's location in Hereford, Colorado, and its proximity to the Omaha District of the US Army Corps of Engineers highlight its significance in water management and conservation efforts within the region.

As a key feature in the water infrastructure of Wyoming, Ulman No. 1 plays a crucial role in supporting agricultural activities in the area. With its historical significance dating back to the 1970s and ongoing state oversight, the dam represents a vital component of the water supply system on Crow Creek. Climate enthusiasts and water resource professionals alike can appreciate the importance of maintaining and monitoring this irrigation structure to ensure its resilience in the face of changing environmental conditions and water resource management challenges.

Year Completed

1970

Dam Length

1200

Dam Height

22

River Or Stream

CROW CREEK

Primary Dam Type

Earth

Surface Area

19

Hydraulic Height

17

Nid Storage

614

Structural Height

22

Outlet Gates

Uncontrolled - 0

Hazard Potential

Low

Foundations

Soil

Nid Height

22
       
Seasonal Comparison

Weather Forecast

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Nearby Streamflow Levels

Ulman No. 1CROW CREEK AT 19TH STREET Preview Crow Creek At 19th Street
3.20cfs
3cfs
Ulman No. 1LODGEPOLE CREEK AT BUSHNELL Preview Lodgepole Creek At Bushnell
1.75cfs
2cfs
Ulman No. 1NORTH FORK CACHE LA POUDRE R. AT LIVERMORE Preview North Fork Cache La Poudre R. At Livermore
3.59cfs
4cfs
Ulman No. 1N FRK CACHE LA POUDRE R BLW HALLIGAN RES NR V DAL Preview N Frk Cache La Poudre R Blw Halligan Res Nr V Dal
0.2cfs
0cfs
Ulman No. 1CACHE LA POUDRE RIVER AT FORT COLLINS Preview Cache La Poudre River At Fort Collins
42.4cfs
42cfs
Ulman No. 1CACHE LA POUDRE R AB BOXELDER C Preview Cache La Poudre R Ab Boxelder C
8.13cfs
8cfs

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.
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