Walters, Glenn #1 - Large is an earth dam located in Washington County, Oregon, built in 1969. It carries a Significant hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 660 ft long, taller than 62% 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 Walters, Glenn #1 - Large
The primary purpose of Walters, Glenn #1 - Large is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Treesap LLC, Dba: Hines Growers (private). It impounds the Tualatin River, Trib to near Farmington.
The dam stands 28 feet tall and stretches 660 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 250 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. The most recent inspection on record was 09/25/2020.
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Location
| State | Oregon |
| County | Washington |
| Nearest City | Farmington |
| River/Stream | Tualatin River, Trib to |
| Coordinates | 45.47505, -123.05609 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 25 ft |
| Dam Length | 660 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 250 acre-ft |
| Max Storage | 250 acre-ft |
| Normal Storage | 132 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 306 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Treesap LLC, Dba: Hines Growers |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 09/25/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00495 |
| Federal ID | OR00495 |
| More Info | State Dam Safety Program |