Lake Lamberjack Upground Reservoir
Lake Lamberjack Upground Reservoir is an earth dam located in Hancock County, Ohio, built in 1919. It carries a High hazard potential classification and has a poor condition assessment.
About Lake Lamberjack Upground Reservoir
The primary purpose of Lake Lamberjack Upground Reservoir is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Fostoria (local government). It impounds the Tributary To East Branch Portage River - Offstream near Fostoria.
The dam stands 19 feet tall and stretches 6,990 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 390 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1919, the structure is over a century old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 06/24/2021.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Ohio dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Ohio |
| County | Hancock |
| Nearest City | Fostoria |
| River/Stream | Tributary To East Branch Portage River - Offstream |
| Coordinates | 41.15639, -83.43194 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 6,990 ft |
| Year Completed | 1919 (107 years old) |
Storage & Hydraulics
| NID Storage | 390 acre-ft |
| Max Storage | 390 acre-ft |
| Normal Storage | 250 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 76 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Fostoria |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 06/24/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH00785 |
| Federal ID | OH00785 |
| More Info | State Dam Safety Program |