Thompson Dam is an earth dam located in Shelby County, Iowa, built in 1974. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 478 ft long, taller than 55% 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 Thompson Dam
The primary purpose of Thompson Dam is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Virgil C Thompson (private). It impounds the Tr-east Br West Nisanabota near Avoca.
The dam stands 26 feet tall and stretches 478 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 140 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1974, the structure is well into its service life at over 50 years 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. The most recent inspection on record was 11/01/1978. That was over 47 years ago.
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Location
| State | Iowa |
| County | Shelby |
| Nearest City | Avoca |
| River/Stream | Tr-east Br West Nisanabota |
| Coordinates | 41.52500, -95.28340 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 478 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 140 acre-ft |
| Max Storage | 140 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Virgil C Thompson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/01/1978 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00982 |
| Federal ID | IA00982 |
| More Info | State Dam Safety Program |