Colwil Lake Dam
Colwil Lake Dam is an earth dam located in Shannon County, Missouri, built in 1959. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Colwil Lake Dam
The primary purpose of Colwil Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Ron Dassow (private). It impounds the Matthews Branch near Van Buren.
The dam stands 47 feet tall and stretches 180 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 360 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1959, 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 10/23/2019.
At 47 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | Missouri |
| County | Shannon |
| Nearest City | Van Buren |
| River/Stream | Matthews Branch |
| Coordinates | 37.19068, -91.26130 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 47 ft |
| Dam Height | 47 ft |
| Dam Length | 180 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 360 acre-ft |
| Max Storage | 360 acre-ft |
| Normal Storage | 299 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 3,200 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | RON DASSOW |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/23/2019 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MO30058 |
| Federal ID | MO30058 |
| More Info | State Dam Safety Program |