Rolls Helen B is an earth dam located in Grady County, Oklahoma, built in 1950. It carries a Low hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall and 360 ft long, taller than 80% 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 Rolls Helen B
Rolls Helen B is a dam in Grady, Oklahoma. The dam is owned by Billie W Smith (private). It impounds the Tr-little Beaver Cr near Marlow.
The dam stands 35 feet tall and stretches 360 feet across, creates a reservoir covering 4 acres, and has a maximum storage capacity of 210 acre-feet. Completed in 1950, the structure is well-established, with more than 75 years of service.
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 08/31/2010. That was over 16 years ago.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Oklahoma |
| County | Grady |
| Nearest City | Marlow |
| River/Stream | Tr-little Beaver Cr |
| Coordinates | 34.70366, -98.06944 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 360 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 210 acre-ft |
| Max Storage | 210 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 4 acres |
| Max Discharge | 2,700 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Other |
| Owner | Billie W Smith |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/31/2010 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OK12922 |
| Federal ID | OK12922 |
| More Info | State Dam Safety Program |