Thayer Lake Dam is an earth dam located in Union County, Iowa, built in 1930. It carries a Low hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 590 ft long, taller than 68% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Thayer Lake Dam
The primary purpose of Thayer Lake Dam 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 Tr-four Mile Creek near Thayer.
The dam stands 30 feet tall and stretches 590 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 222 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1930, the structure is well-established, with more than 75 years of service.
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. The most recent inspection on record was 10/23/2003. That was over 22 years ago.
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Location
| State | Iowa |
| County | Union |
| Nearest City | Thayer |
| River/Stream | Tr-four Mile Creek |
| Coordinates | 41.02190, -94.06450 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 590 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 222 acre-ft |
| Max Storage | 222 acre-ft |
| Normal Storage | 91 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Iowa Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/23/2003 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01377 |
| Federal ID | IA01377 |
| More Info | State Dam Safety Program |