Chapman Wm Reservoir Report
Nearby: Oteka Lake Reuel
Last Updated: December 6, 2025
Chapman Wm is a privately owned dam located in Marshall, Oklahoma, specifically in the city of RAVCIA.
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Summary
Built in 1977, this earth dam stands at a height of 20 feet and serves the primary purpose of flood risk reduction along the TR. WASHITA RIVER. With a maximum storage capacity of 80 acre-feet and a normal storage of 50 acre-feet, the dam plays a crucial role in managing water flow and protecting the surrounding areas from potential flooding.
Managed by the Oklahoma Water Resources Board (OWRB), Chapman Wm has a low hazard potential and a very high risk assessment rating of 1. While the dam has not been rated for its condition, it is inspected every 5 years to ensure its structural integrity and effectiveness in flood control. With a controlled spillway and valve outlet gates, the dam is equipped to handle a maximum discharge of 2325 cubic feet per second, reducing the risk of overflow and downstream flooding during heavy rainfall events.
Despite being a privately owned structure, Chapman Wm falls under the jurisdiction of the state regulatory agency and is subject to state permitting, inspection, and enforcement. The dam is located within the Fort Worth District of the US Army Corps of Engineers and is classified as a vital component in the region's flood risk reduction strategy. With its strategic location and effective design, Chapman Wm stands as a testament to the importance of water resource management and climate resilience in the face of changing environmental conditions.
Year Completed |
1977 |
Dam Length |
542 |
Dam Height |
20 |
River Or Stream |
TR. WASHITA RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
80 |
Structural Height |
20 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Washita River Near Dickson
|
317cfs |
Pennington Creek Near Reagan
|
7cfs |
Blue River Near Connerville
|
54cfs |
Rock Creek At Sulphur
|
8cfs |
Red River At Denison Dam Nr Denison
|
44cfs |
Red River Near Gainesville
|
386cfs |
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 Wm