Mississippi River Lock And Dam 24
Mississippi River Lock And Dam 24 is a concrete dam located in Calhoun County, Missouri, built in 1940. It carries a Significant hazard potential classification.
About Mississippi River Lock And Dam 24
The primary purpose of Mississippi River Lock And Dam 24 is navigation. The dam maintains water levels sufficient for boat and barge traffic, supporting commercial or recreational navigation on the waterway. The dam is owned by Usace - St. Louis District (federal). It impounds the Mississippi River near Clarksville.
The dam stands 76 feet tall and stretches 4,584 feet across, creates a reservoir covering 13,000 acres, has a maximum storage capacity of 125,363 acre-feet, and collects water from a drainage area of 140,900 square miles. Completed in 1940, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 03/15/2022.
At 76 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | Missouri |
| County | Calhoun |
| Nearest City | Clarksville |
| River/Stream | Mississippi River |
| Coordinates | 39.37905, -90.90108 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 76 ft |
| Dam Height | 55 ft |
| Dam Length | 4,584 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 125,363 acre-ft |
| Max Storage | 125,363 acre-ft |
| Normal Storage | 125,363 acre-ft |
| Surface Area | 13,000 acres |
| Drainage Area | 140,900 sq mi |
| Max Discharge | 364,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Navigation |
| Owner | USACE - St. Louis District |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 03/15/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO10300 |
| Federal ID | MO10300 |
| More Info | State Dam Safety Program |