Chapman Dam Reservoir Report
Nearby: Sweet Carolyn The Man Dam
Last Updated: December 20, 2025
Chapman Dam is a gravity dam located in Valley, Montana, completed in 2003 by the Bureau of Land Management.
°F
°F
mph
Wind
%
Humidity
Summary
Standing at a structural height of 14 feet and a hydraulic height of 7 feet, this dam provides a storage capacity of 54.53 acre-feet and covers a surface area of 18.39 acres. With a length of 793 feet, Chapman Dam serves as a vital structure for water resource management in the region.
Managed by the Bureau of Land Management, Chapman Dam is classified as having a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite not being regulated by the state, it undergoes inspections every five years to ensure its safety and reliability. The dam does not have an Emergency Action Plan in place, but its purpose and design as a gravity dam with stone buttress core types highlight its importance in water resource management and climate resilience efforts in the area.
Chapman Dam is a testament to the Bureau of Land Management's commitment to sustainable water resource management in Montana. As a key structure in the region, it not only provides essential storage capacity but also contributes to flood control and water supply for the surrounding communities. With its strategic location and design, Chapman Dam plays a crucial role in supporting the ecological balance and climate resilience efforts in Valley, Montana.
Year Completed |
2003 |
Dam Length |
793 |
Primary Dam Type |
Gravity |
Surface Area |
18.39 |
Hydraulic Height |
7 |
Nid Storage |
54.53 |
Structural Height |
14 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
14 |
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.
Chapman Dam