Lost Grove Lake
Lost Grove Lake is an earth dam located in Scott County, Iowa, built in 2012. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Lost Grove Lake
The primary purpose of Lost Grove Lake is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Iowa Department Of Natural Resources (state). It impounds the Lost Creek near Mississippi River.
The dam stands 75 feet tall and stretches 1,165 feet across, creates a reservoir covering 350 acres, has a maximum storage capacity of 9,595 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 2012, the structure is relatively new.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 10/17/2024.
At 75 feet, this dam is taller than 97% of all dams in the United States.
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 Iowa 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 | Iowa |
| County | Scott |
| Nearest City | Mississippi River |
| River/Stream | Lost Creek |
| Coordinates | 41.66940, -90.43510 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 75 ft |
| Dam Height | 75 ft |
| Dam Length | 1,165 ft |
| Year Completed | 2012 (14 years old) |
Storage & Hydraulics
| NID Storage | 9,595 acre-ft |
| Max Storage | 9,595 acre-ft |
| Normal Storage | 6,080 acre-ft |
| Surface Area | 350 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 8,115 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Iowa Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/17/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IA04083 |
| Federal ID | IA04083 |
| More Info | State Dam Safety Program |