Knoll is an earth dam located in Coconino County, Arizona, built in 1963. It carries a Low hazard potential classification.
Dam profile
NID height · 63 ft63 ft tall and 500 ft long, taller than 95% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Knoll
The primary purpose of Knoll is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Arizona Game & Fish Department (state). It impounds the East Leonard Canyon Creek near Winslow.
The dam stands 63 feet tall and stretches 500 feet across, creates a reservoir covering 77 acres, has a maximum storage capacity of 1,774 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1963, 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 05/17/2012. That was over 14 years ago.
At 63 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Arizona |
| County | Coconino |
| Nearest City | Winslow |
| River/Stream | East Leonard Canyon Creek |
| Coordinates | 34.43139, -111.08500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 63 ft |
| Dam Height | 58 ft |
| Dam Length | 500 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 1,774 acre-ft |
| Max Storage | 1,774 acre-ft |
| Normal Storage | 1,550 acre-ft |
| Surface Area | 77 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 875 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Arizona Game & Fish Department |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 05/17/2012 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AZ00041 |
| Federal ID | AZ00041 |
| More Info | State Dam Safety Program |