Pinnacle Lake Dam Reservoir Report
Last Updated: December 13, 2025
Pinnacle Lake Dam, located in Montgomery County, Missouri, stands as a private-owned structure with a primary purpose of recreation.
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Summary
Completed in 1965, this Earth-type dam spans 800 feet in length and reaches a height of 49 feet, holding a storage capacity of 2,607 acre-feet. Situated on Pinnacle Creek, the dam serves as a crucial water resource for the region, with a drainage area of 4,495 acres and a maximum discharge rate of 22,069 cubic feet per second.
Despite its satisfactory condition assessment, Pinnacle Lake Dam has been classified with a high hazard potential, signaling the critical importance of its maintenance and regulation. The dam is subject to state jurisdiction, regulation, permitting, inspection, and enforcement by the Dam and Reservoir Safety Program in Missouri. With a risk assessment rating of moderate and a two-year inspection frequency, efforts are in place to ensure the safety and reliability of this vital water infrastructure.
Water resource and climate enthusiasts will be intrigued by the role of Pinnacle Lake Dam in balancing recreation and water management in the region. As a significant feature on the landscape, the dam not only provides leisure opportunities but also underscores the need for diligent risk management and emergency preparedness. With a rich history dating back to the 1960s, Pinnacle Lake Dam continues to play a crucial role in the local water supply and ecosystem, highlighting the intersection of human infrastructure and environmental stewardship.
Year Completed |
1965 |
Dam Length |
800 |
Dam Height |
49 |
River Or Stream |
PINNACLE CREEK |
Primary Dam Type |
Earth |
Surface Area |
118 |
Drainage Area |
4495 |
Nid Storage |
2607 |
Structural Height |
49 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
49 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Missouri River At Hermann
|
28000cfs |
Cuivre River Near Troy
|
131cfs |
Bourbeuse River At Union
|
80cfs |
Gasconade River Near Rich Fountain
|
820cfs |
Dardenne Creek At Ofallon
|
6cfs |
Maries River At Westphalia
|
11cfs |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Hermann City RV Park
|
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Graham Cave State Park
|
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Camping @ Graham Cave State Park
|
Pinnacle Lake Dam