Unger-Bill Dam dam
Unger-Bill Dam
Unger-Bill Dam, located in Farmington, Oregon, is a privately owned structure that plays a crucial role in irrigation along the Tualatin River. Built in 1968, this earth-type dam stands at a height of 39 feet and has a storage capacity of 97 acre-feet. With a normal storage capacity of 80 acre-feet, the dam covers a surface area of 5.2 acres and serves a drainage area of 0.27 square miles.
Managed by the Natural Resources Conservation Service, Unger-Bill Dam is regulated by the Oregon Water Resources Department and undergoes regular inspections to ensure its safety and functionality. The dam features a slide gate outlet system and has a significant hazard potential, although its condition assessment is currently not rated. Despite this, the dam continues to provide vital irrigation water for the surrounding area and contributes to the region's water resource management efforts.
With the support of local authorities and the dedication of its owners, Unger-Bill Dam remains a key infrastructure for water supply and agricultural needs in Washington County, Oregon. Its presence highlights the importance of sustainable water resource management and the essential role that dams play in supporting local communities and ecosystems amidst changing climate conditions.
Dam data reference
Condition Assessment
- Satisfactory
- No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
- Fair
- No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
- Poor
- A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency.
- Unsatisfactory
- A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
- Not Rated
- The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Hazard Potential Classification
- High
- Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
- Significant
- Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
- Low
- Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
- Undetermined
- Dams for which a downstream hazard potential has not been designated or is not provided.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Unger-Bill Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Tualatin River Near Dilley | 123 cfs | → |
| Willamette River At Newberg | 10,700 cfs | → |
| East Fork Dairy Creek Near Meacham Corner | 21 cfs | → |
| Fanno Creek At Durham | 14 cfs | → |
| Fanno Creek At 56th Ave | 2 cfs | → |
| Columbia Slough At Portland | 476 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Unger-Bill Dam.
Boat launches
- Crescent Park Greenway Hillsboro
- Cook Park
- Tualatin Community Park
- Sauvie Island Boat Ramp
- Dayton Boat Ramp
- San Salvador Access
Campgrounds
Track Unger-Bill Dam in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Unger-Bill Dam
Where does the data for Unger-Bill Dam come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Significant hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Unger-Bill Dam.