Flying M Ranch Lake Dam is an earth dam located in Washington County, Illinois, built in 1963. It carries a Low hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 590 ft long. 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 Flying M Ranch Lake Dam
The primary purpose of Flying M Ranch Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Homer L. Mathis (private). It impounds the Trib Sewer Creek near Wertenburg.
The dam stands 11 feet tall and stretches 590 feet across, and has a maximum storage capacity of 107 acre-feet. Completed in 1963, 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 04/29/2022.
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Location
| State | Illinois |
| County | Washington |
| Nearest City | Wertenburg |
| River/Stream | Trib Sewer Creek |
| Coordinates | 38.50331, -89.19553 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 590 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 107 acre-ft |
| Max Storage | 107 acre-ft |
| Normal Storage | 39 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Homer L. Mathis |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 04/29/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00399 |
| Federal ID | IL00399 |
| More Info | State Dam Safety Program |