Rapp Lake Dam Reservoir Report
Nearby: Cedar Lake Dam-Sec 23 Smarr Lake Dam
Last Updated: January 10, 2026
Rapp Lake Dam, located in Boone, Missouri, is a privately owned structure that serves primarily as a Fish and Wildlife Pond.
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Summary
Built in 1968, this Earth-type dam stands at a height of 30 feet and has a length of 480 feet, with a storage capacity of 40 acre-feet. The dam sits on the TR-BLACK BRANCH stream and is managed under the jurisdiction of the St. Louis District.
With a low hazard potential and a moderate risk rating, Rapp Lake Dam is currently not rated for its condition assessment. Despite its uncontrolled spillway type and lack of outlet gates, the dam has not undergone recent inspections or maintenance evaluations. While it has not been subjected to state regulation, permitting, or enforcement, the dam remains an important structure for fire protection, recreation, and wildlife conservation in the region.
For water resource and climate enthusiasts, Rapp Lake Dam presents an intriguing case study of a privately owned dam with various purposes beyond flood control. Its location in a rural setting, lack of federal involvement, and unique design features make it a notable site for further exploration and monitoring. As the dam continues to serve the community for fish and wildlife management, its risk assessment and maintenance practices may warrant closer attention to ensure its long-term safety and effectiveness in the face of changing environmental conditions.
Year Completed |
1968 |
Dam Length |
480 |
Dam Height |
30 |
River Or Stream |
TR-BLACK BRANCH |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
30 |
Drainage Area |
19.2 |
Nid Storage |
40 |
Structural Height |
30 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Hinkson Creek At Columbia
|
6cfs |
Moniteau Creek Near Fayette
|
5cfs |
Missouri River At Boonville
|
29700cfs |
Missouri River At Jefferson City
|
28600cfs |
Missouri River At Glasgow
|
30000cfs |
Moreau River Near Jefferson City
|
22cfs |
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.
Rapp Lake Dam