Kostyshock Lake Dam is an earth dam located in Jefferson County, Missouri, built in 1948. It carries a High hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 38 ft38 ft tall and 625 ft long, taller than 84% 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 Kostyshock Lake Dam
The primary purpose of Kostyshock Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Daniel & Jillian Tomlinson (private). It impounds the Tr to Big River near Desoto.
The dam stands 38 feet tall and stretches 625 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 272 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1948, 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 04/27/2021.
At 38 feet, this dam is taller than 84% of dams nationwide.
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 | Desoto |
| River/Stream | Tr to Big River |
| Coordinates | 38.10793, -90.61927 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 625 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 272 acre-ft |
| Max Storage | 272 acre-ft |
| Normal Storage | 102 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 390 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Daniel & Jillian Tomlinson |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/27/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO30455 |
| Federal ID | MO30455 |
| More Info | State Dam Safety Program |