Pillar Creek Dam No.1.a is an earth dam located in Kodiak Island Borough, Alaska, built in 1969. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 45 ft45 ft tall and 98 ft long, taller than 90% 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 Pillar Creek Dam No.1.a
The primary purpose of Pillar Creek Dam No.1.a is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City of Kodiak (local government). It impounds the Pillar Creek near Kodiak.
The dam stands 45 feet tall and stretches 98 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 45 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1969, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 05/21/2019.
At 45 feet, this dam is taller than 90% of dams nationwide.
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Location
| State | Alaska |
| County | Kodiak Island Borough |
| Nearest City | Kodiak |
| River/Stream | Pillar Creek |
| Coordinates | 57.80071, -152.44810 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 45 ft |
| Dam Length | 98 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 45 acre-ft |
| Max Storage | 45 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 280 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Kodiak |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/21/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | AK00020 |
| Federal ID | AK00020 |
| More Info | State Dam Safety Program |