Lost Nation Lake # 5 Dam Reservoir Report
Nearby: Pittsford Mill Dam Weatherwood Dam
Last Updated: December 5, 2025
Lost Nation Lake # 5 Dam, located in Hillsdale, Michigan, is a state-owned earth dam completed in 1956 for recreational purposes.
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Summary
With a height of 12.3 feet and a maximum storage capacity of 210 acre-feet, this dam serves as a vital water resource for the surrounding area. The dam spans 170 feet in length and has a surface area of 25 acres, providing a serene setting for outdoor activities and wildlife habitat.
Despite its low hazard potential and moderate risk assessment, Lost Nation Lake # 5 Dam has not been rated for its condition. The dam's uncontrolled spillway and limited inspection history may raise concerns for water resource and climate enthusiasts. The dam's location on a tributary to the East Branch St Joseph River adds to its importance in the local ecosystem and highlights the need for regular monitoring and maintenance to ensure its structural integrity and safety.
With a history dating back to the mid-20th century, Lost Nation Lake # 5 Dam stands as a testament to Michigan's commitment to providing recreational opportunities while managing water resources effectively. As climate change continues to impact water availability and quality, the importance of maintaining and evaluating dams like Lost Nation Lake # 5 becomes increasingly crucial. By staying informed and advocating for responsible water management practices, enthusiasts can play a vital role in preserving these essential resources for future generations.
Year Completed |
1956 |
Dam Length |
170 |
Dam Height |
12.3 |
River Or Stream |
Trib to E Br St Joseph |
Primary Dam Type |
Earth |
Surface Area |
25 |
Hydraulic Height |
11.3 |
Drainage Area |
0.9 |
Nid Storage |
210 |
Structural Height |
12.3 |
Hazard Potential |
Low |
Nid Height |
12 |
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.
Lost Nation Lake # 5 Dam