Troy Mills Dam is a gravity dam located in Linn County, Iowa, built in 1989. It carries a Low hazard potential classification.
Dam profile
NID height · 7 ft7 ft tall and 300 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Troy Mills Dam
The primary purpose of Troy Mills Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Troy Mills Dam Association (private). It impounds the Wapsipinicon River near Troy Mills.
The dam stands 7 feet tall and stretches 300 feet across, creates a reservoir covering 182 acres, has a maximum storage capacity of 640 acre-feet, and collects water from a drainage area of 1,210 square miles. Completed in 1989, the structure is 37 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.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Iowa |
| County | Linn |
| Nearest City | Troy Mills |
| River/Stream | Wapsipinicon River |
| Coordinates | 42.28790, -91.68300 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 300 ft |
| Year Completed | 1989 (37 years old) |
Storage & Hydraulics
| NID Storage | 640 acre-ft |
| Max Storage | 640 acre-ft |
| Normal Storage | 640 acre-ft |
| Surface Area | 182 acres |
| Drainage Area | 1,210 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Troy Mills Dam Association |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA02468 |
| Federal ID | IA02468 |
| More Info | State Dam Safety Program |