Hoefer-Pierson Reservoir dam
Hoefer-Pierson Reservoir
Hoefer-Pierson Reservoir, located in Oregon, serves as a vital water resource for irrigation purposes in the region. Owned privately, this reservoir was completed in 1970 and has a storage capacity of 16 acre-feet, with a normal storage level of 15.8 acre-feet. Situated along Christensen Creek, the dam stands at a height of 23 feet and has a hydraulic height of 17 feet, providing essential water management for the surrounding area.
With a significant hazard potential, Hoefer-Pierson Reservoir is regulated and inspected by the Oregon Water Resources Department to ensure its structural integrity and operational efficiency. The reservoir features a needle outlet gate and has a maximum discharge capacity of 652 cubic feet per second. Despite not being rated for its condition, the reservoir plays a crucial role in supporting agricultural activities and water supply in the region, highlighting the importance of sustainable water resource management in the face of changing climate conditions.
As a key component of the irrigation infrastructure in Washington County, Oregon, Hoefer-Pierson Reservoir offers valuable insights into the challenges and opportunities associated with water resource management in the region. With its strategic location and essential role in providing water for agricultural activities, this reservoir serves as a critical lifeline for local communities and underscores the need for effective regulatory oversight and maintenance to ensure its long-term sustainability in the face of evolving 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 Hoefer-Pierson Reservoir -- 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 | → |
| Fanno Creek At Durham | 14 cfs | → |
| Fanno Creek At 56th Ave | 2 cfs | → |
| East Fork Dairy Creek Near Meacham Corner | 21 cfs | → |
| Tryon Creek Blw Nettle Creek | 9 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hoefer-Pierson Reservoir.
Boat launches
- Crescent Park Greenway Hillsboro
- Cook Park
- Tualatin Community Park
- San Salvador Access
- Dayton Boat Ramp
- Sauvie Island Boat Ramp
Campgrounds
Track Hoefer-Pierson Reservoir 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 Hoefer-Pierson Reservoir
Where does the data for Hoefer-Pierson Reservoir 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 Hoefer-Pierson Reservoir.