Moss Bluff Lock and Spillway is an earth dam located in Marion County, Florida, built in 1969. It carries a Low hazard potential classification.
Dam profile
NID height · 44 ft44 ft tall and 485 ft long, taller than 89% 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 Moss Bluff Lock and Spillway
The primary purpose of Moss Bluff Lock and Spillway 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 Sjrwmd (local government). It impounds the Oklawaha River near Grahamsville.
The dam stands 44 feet tall and stretches 485 feet across, creates a reservoir covering 476 acres, and has a maximum storage capacity of 151,200 acre-feet. Completed in 1969, 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 10/21/2024.
At 44 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Florida |
| County | Marion |
| Nearest City | Grahamsville |
| River/Stream | Oklawaha River |
| Coordinates | 29.07964, -81.88227 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 44 ft |
| Dam Length | 485 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 151,200 acre-ft |
| Max Storage | 151,200 acre-ft |
| Normal Storage | 4,350 acre-ft |
| Surface Area | 476 acres |
| Max Discharge | 3,420 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Navigation |
| Owner | Sjrwmd |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/21/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | FL00145 |
| Federal ID | FL00145 |
| More Info | State Dam Safety Program |