Seaside City dam
Seaside City
Seaside City, also known as Peterson Point Dam, is a vital water supply infrastructure owned by the local government in Clatsop, Oregon. Situated on the Necanicum River, this earth dam stands at 45 feet high and has a hydraulic height of 30 feet, providing a storage capacity of 170 acre-feet. Completed in 1996, Seaside City serves as a crucial resource for the city's water needs, with a surface area of 12.5 acres and a drainage area of 1.4 square miles.
With a high hazard potential but a satisfactory condition assessment as of October 2020, Seaside City is equipped with slide gates for outlet control and undergoes regular inspections to ensure its safety and functionality. The dam plays a crucial role in water supply management for the city, with a maximum discharge capacity of 68 cubic feet per second. Despite its age, Seaside City continues to meet the water supply needs of the community and is regulated by the Oregon Water Resources Department, demonstrating a commitment to ensuring the sustainability and reliability of the region's water resources in the face of climate challenges.
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 Seaside City -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Nehalem River Near Foss | 458 cfs | → |
| Naselle River Near Naselle | 99 cfs | → |
| Nehalem River Near Vernonia | 51 cfs | → |
| Wilson River Near Tillamook | 241 cfs | → |
| Trask River Above Cedar Creek | 197 cfs | → |
| Columbia River @ Beaver Army Terminal Nr Quincy | 70,400 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Seaside City.
Boat launches
- Sef Johnson Tract
- Klootchy Creek Park
- Sunset Beach Road Clatsop County
- Nehalem Fish Hatchery
- Aldervale
- Tohl Ranch Road Tillamook County
Campgrounds
- Ecola Park Hiker's Camp
- Saddle Mountain State Park
- Saddle Mountain Campground
- Fort Stevens State Park Campground
- Nehalem Falls Campground
- Nehalem Falls - State Forestry
Paddle runs
Track Seaside City 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 Seaside City
Where does the data for Seaside City 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 High 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 Seaside City.