Posey Lake Level Control Structure Reservoir Report
Nearby: Spencer Dam Sparrow Dam
Last Updated: December 26, 2025
The Posey Lake Level Control Structure, also known as Posey Lake Dam, is a private-owned gravity dam located in Hudson, Michigan.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1955, the dam serves primarily for recreational purposes, maintaining a normal storage capacity of 190 acre-feet and a maximum storage of 715 acre-feet. With a structural height of 7.3 feet and a hydraulic height of 5.8 feet, the dam plays a crucial role in managing the water levels of Posey Lake Drain.
The dam's spillway, with a width of 11 feet, is uncontrolled, and the structure has a low hazard potential with a satisfactory condition assessment as of the last inspection in May 2020. Despite being privately owned and not under state jurisdiction or regulation, the Posey Lake Level Control Structure is a vital component of the local water resource management system. Enthusiasts of water resources and climate will find this structure fascinating for its historical significance and role in supporting recreational activities in the area.
As a part of the Detroit District, the Posey Lake Level Control Structure stands as a testament to the engineering and design efforts that have shaped Michigan's water infrastructure. With a moderate risk assessment and regular inspections, the dam continues to provide valuable support to the community while enhancing the recreational experience for residents and visitors alike. Its strategic location and functionality make it a noteworthy landmark for those interested in water resource management and climate resilience efforts in the region.
Year Completed |
1955 |
Dam Length |
15 |
Dam Height |
7.3 |
River Or Stream |
Posey Lake Drain |
Primary Dam Type |
Gravity |
Surface Area |
150 |
Hydraulic Height |
5.8 |
Nid Storage |
715 |
Structural Height |
7.3 |
Hazard Potential |
Low |
Nid Height |
7 |
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.
Posey Lake Level Control Structure