Elmer Reservoir 1 (Union) dam
Elmer Reservoir 1 (Union)
Elmer Reservoir 1, located in Union, Oregon, is a private-owned water resource primarily used for irrigation purposes. Completed in 1966, this earth dam stands at 16 feet high and has a storage capacity of 128 acre-feet. Situated along the Grande Ronde River, the reservoir covers a surface area of 15 acres and serves as a crucial water source for agricultural activities in the region.
With a low hazard potential and a condition assessment of "Not Rated," Elmer Reservoir 1 is considered to be in good structural condition. The dam features a slide (sluice gate) outlet gate and has a hydraulic height of 12 feet. Despite not being regularly inspected, the reservoir meets state regulatory standards for permitting, inspection, and enforcement, ensuring its safe operation and maintenance.
Although the dam has not been modified in recent years and lacks certain emergency preparedness measures, Elmer Reservoir 1 remains a vital water infrastructure serving the irrigation needs of the local community. With its strategic location and reliable water storage capacity, the reservoir plays a crucial role in supporting agricultural activities and ensuring water resource sustainability in Union, Oregon.
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 Elmer Reservoir 1 (Union) -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Minam River Near Minam | 724 cfs | → |
| Meacham Creek At Gibbon | 14 cfs | → |
| Umatilla River Above Meacham Creek | 98 cfs | → |
| Grande Ronde River At Troy | 2,030 cfs | → |
| Mill Creek Near Walla Walla | 46 cfs | → |
| Umatilla R At W Reservation Bndy Nr Pendleton | 116 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Elmer Reservoir 1 (Union).
Boat launches
- Morgan Lake Campground
- Minam State Recreation Area
- Wolf Creek Boat Ramp
- Palmer Junction Boat Launch
- Thief Valley
- Pilcher Creek Reservoir
Campgrounds
- Moss Springs Campground
- Moss Springs
- Hu - Na - Ha Rv Park
- Catherine Creek State Park
- Bear Creek Campground
- Summit Guard Station
Paddle runs
- Headwaters (Just North Of Confluence Of Mf Five Points Creek) To Wallowa-Whitman Nf Boundary
- Headwaters To Confluence With Van Patten Creek
- Headwaters To Eagle Cap Wilderness Boundary
- Eagle Cap Wilderness Boundary To Confluence With Eagle Crek
- Joseph Creek
- Grande Ronde River (Lower)
Track Elmer Reservoir 1 (Union) 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 Elmer Reservoir 1 (Union)
Where does the data for Elmer Reservoir 1 (Union) 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 Low 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 Elmer Reservoir 1 (Union).