Lake Tishomingo Dam
Lake Tishomingo Dam is an earth dam located in Jefferson County, Missouri, built in 1950. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Lake Tishomingo Dam
The primary purpose of Lake Tishomingo Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake Tishomingo Poa (private). It impounds the Tributary To Belew Creek near Cedar Hill.
The dam stands 68 feet tall and stretches 870 feet across, creates a reservoir covering 120 acres, has a maximum storage capacity of 3,128 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1950, the structure is well-established, with more than 75 years of service.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/27/2020.
At 68 feet, this dam is taller than 96% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Missouri dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Missouri |
| County | Jefferson |
| Nearest City | Cedar Hill |
| River/Stream | Tributary To Belew Creek |
| Coordinates | 38.31733, -90.60254 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 68 ft |
| Dam Height | 68 ft |
| Dam Length | 870 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 3,128 acre-ft |
| Max Storage | 3,128 acre-ft |
| Normal Storage | 2,376 acre-ft |
| Surface Area | 120 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 3,672 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | LAKE TISHOMINGO POA |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/27/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO30039 |
| Federal ID | MO30039 |
| More Info | State Dam Safety Program |