Coffman Dam is an earth dam located in Tama County, Iowa, built in 1965. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 523 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 Coffman Dam
The primary purpose of Coffman 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 Chester Coffman (private). It impounds the Tr-iowa River near Koszta.
The dam stands 26 feet tall and stretches 523 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 83 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1965, 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 11/29/1960. That was over 65 years ago.
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Location
| State | Iowa |
| County | Tama |
| Nearest City | Koszta |
| River/Stream | Tr-iowa River |
| Coordinates | 41.86340, -92.34990 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 523 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 83 acre-ft |
| Max Storage | 83 acre-ft |
| Normal Storage | 57 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Chester Coffman |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/29/1960 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00674 |
| Federal ID | IA00674 |
| More Info | State Dam Safety Program |