Leo Reservoir Report

Last Updated: December 13, 2025

Leo, a private water resource in Richland, Montana, serves multiple purposes including fire protection, stock, and small fish pond.


°F

°F

mph

Wind

%

Humidity

Summary

Constructed in 1965 by USDA NRCS, Leo is regulated by DNRC and falls under the jurisdiction of the state. Located in Dore, North Dakota, Leo is situated on TR-Fourmile Creek and has a low hazard potential with a moderate risk assessment rating.

This earth dam stands at a height of 15 feet with a length of 250 feet, providing a storage capacity of 55 acre-feet. The spillway, which is uncontrolled, has a width of 60 feet and a maximum discharge of 600 cfs. Leo's drainage area is 0.31 square miles, and it covers a surface area that supports its primary functions effectively.

Although Leo has not been recently inspected and its condition is not rated, the water resource meets guidelines and has not undergone any modifications. With its strategic location and design, Leo contributes to water management efforts in the region and offers valuable insights for water resource and climate enthusiasts interested in sustainable water infrastructure.

Year Completed

1965

Dam Length

250

Dam Height

15

River Or Stream

TR-FOURMILE CREEK

Primary Dam Type

Earth

Hydraulic Height

15

Drainage Area

0.31

Nid Storage

55

Hazard Potential

Low

Nid Height

15
       
Seasonal Comparison

Weather Forecast

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.