Rock Island Lake Dam is an earth dam located in Cass County, Missouri, built in 1904. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall, taller than 50% 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 Rock Island Lake Dam
The primary purpose of Rock Island Lake Dam is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Boone Ingels Jr (private). It impounds the Tr-big Creek near Pleasant Hill.
The dam stands 25 feet tall, creates a reservoir covering 15 acres, has a maximum storage capacity of 201 acre-feet, and collects water from a drainage area of 210 square miles. Completed in 1904, the structure is over a century 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.
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Location
| State | Missouri |
| County | Cass |
| Nearest City | Pleasant Hill |
| River/Stream | Tr-big Creek |
| Coordinates | 38.79580, -94.29211 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Year Completed | 1904 (122 years old) |
Storage & Hydraulics
| NID Storage | 201 acre-ft |
| Max Storage | 201 acre-ft |
| Normal Storage | 125 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 210 sq mi |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Boone Ingels Jr |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO20311 |
| Federal ID | MO20311 |
| More Info | State Dam Safety Program |