Multnomanh Channel Dam #2 dam
Multnomanh Channel Dam #2
Multnomanh Channel Dam #2, located in Multnomah County, Oregon, is a private dam regulated by the Oregon Water Resources Department. Standing at a height of 11.5 feet with a storage capacity of 240 acre-feet, this dam plays a crucial role in managing water resources in the area. Although its primary purpose and dam type are not specified, its low hazard potential and "Not Rated" condition assessment indicate that it is well-maintained and poses minimal risk to surrounding communities.
This dam, also known as Ducks Unlimited South Reservoir, is situated on a tributary of the Columbia River and falls under the jurisdiction of the Portland District of the US Army Corps of Engineers. While specific details about its construction and function remain unclear, its presence highlights the importance of private entities in water resource management. With inspection frequency set at 6 years and the last inspection conducted in December 2016, Multnomanh Channel Dam #2 demonstrates a commitment to ensuring its structural integrity and the safety of downstream areas.
As a pivotal structure in the region's water infrastructure, Multnomanh Channel Dam #2 serves as a reminder of the complex network of dams and reservoirs that contribute to water supply, flood control, and environmental conservation efforts. While further information regarding its design, purpose, and operation is needed to fully understand its role, its presence underscores the interconnectedness of water resources and the need for ongoing monitoring and maintenance to ensure the safety and sustainability of our water systems.
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 Multnomanh Channel Dam #2 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Columbia Slough At Portland | 580 cfs | → |
| Burnt Bridge Creek Near Mouth At Vancouver | 37 cfs | → |
| East Fork Dairy Creek Near Meacham Corner | 21 cfs | → |
| Fanno Creek At 56th Ave | 0 cfs | → |
| Willamette River At Portland | 17,500 cfs | → |
| Tualatin River Near Dilley | 96 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Multnomanh Channel Dam #2.
Boat launches
- Happy Rock Moorage Inc.
- Sauvie Island Boat Ramp
- Big Oak Marina
- Haldman Pond Hand Launch
- Sauvie Island Wildlife Area
- Northwest Oak Island Road 25499, Portland
Campgrounds
- Paradise Point State Park
- Brooke Creek Hike-In Camp
- Scaponia County Park
- L. L. Stub Stewart State Park
- Vernonia Lake Primative Campground
- Camp Wilkerson
Track Multnomanh Channel Dam #2 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 Multnomanh Channel Dam #2
Where does the data for Multnomanh Channel Dam #2 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 Multnomanh Channel Dam #2.