Riddle is an earth dam located in St. Clair County, Alabama, built in 1951. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 150 ft long. 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 Riddle
The primary purpose of Riddle is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mrs June Riddle (private). It impounds the Middle Black Creek near Margaret.
The dam stands 15 feet tall and stretches 150 feet across, and has a maximum storage capacity of 50 acre-feet. Completed in 1951, 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.
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Location
| State | Alabama |
| County | St. Clair |
| Nearest City | Margaret |
| River/Stream | Middle Black Creek |
| Coordinates | 33.70667, -86.44667 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Length | 150 ft |
| Year Completed | 1951 (75 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 38 acre-ft |
| Max Discharge | 200 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Mrs June Riddle |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | No |
Identifiers
| NID ID | AL01050 |
| Federal ID | AL01050 |
| More Info | ASDSO on Alabama (no state dam safety program) |