Thompson Mill Dam (in-channel)
Thompson Mill Dam (in-channel) is a stone dam located in Johnson County, Indiana, built in 1884. It carries a Low hazard potential classification and has a fair condition assessment.
About Thompson Mill Dam (in-channel)
Thompson Mill Dam (in-channel) is a dam in Johnson, Indiana. The dam is owned by Town Of Edinburgh (local government). It impounds the Big Blue River.
The dam stands 10 feet tall and stretches 300 feet across, creates a reservoir covering 64 acres, has a maximum storage capacity of 321 acre-feet, and collects water from a drainage area of 581 square miles. Completed in 1884, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 03/22/2017.
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Location
| State | Indiana |
| County | Johnson |
| River/Stream | Big Blue River |
| Coordinates | 39.35605, -85.97653 |
Physical Characteristics
| Dam Type | Stone |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 300 ft |
| Year Completed | 1884 (142 years old) |
Storage & Hydraulics
| NID Storage | 321 acre-ft |
| Max Storage | 321 acre-ft |
| Surface Area | 64 acres |
| Drainage Area | 581 sq mi |
| Spillway Type | None |
Ownership & Safety
| Purpose | Other |
| Owner | Town of Edinburgh |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 03/22/2017 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IN03150 |
| Federal ID | IN03150 |
| More Info | State Dam Safety Program |