Stewart Gulch Main Fork dam
Stewart Gulch Main Fork
Stewart Gulch Main Fork is a vital flood risk reduction structure located in Boise, Idaho. Completed in 1998 by Morrison Knudsen Corp, this earth dam stands at a height of 76.3 feet and has a hydraulic height of 73.4 feet, offering protection to the surrounding area from potential flooding events. With a storage capacity of 61 acre-feet and a maximum discharge of 168 cubic feet per second, this dam plays a crucial role in managing water flow and reducing the risk of flooding in the region.
Owned and regulated by the Idaho Department of Water Resources, Stewart Gulch Main Fork is inspected regularly to ensure its structural integrity and functionality. The dam is classified as having a significant hazard potential, but its condition is assessed as satisfactory. With a very high risk assessment ranking of 1, it is clear that the importance of this structure in mitigating flood risks in the area cannot be overstated. The dam's controlled spillway, with a width of 56 feet, further enhances its ability to manage water levels during periods of high flow.
As a key component in the flood risk reduction infrastructure of Boise, Stewart Gulch Main Fork serves as a critical line of defense against potential water-related disasters. With its robust design and satisfactory condition, this dam continues to play a vital role in protecting the local community and surrounding areas from the impacts of flooding. Its presence underscores the importance of proactive water resource management and climate resilience efforts in safeguarding communities against the growing challenges posed by a changing climate.
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 Stewart Gulch Main Fork -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Boise River At Glenwood Bridge Nr Boise Id | 1,760 cfs | → |
| Cottonwood Creek Bel Fivemile Cr Nr Boise Id | 1 cfs | → |
| Dry Creek Nr Eagle Id | 0 cfs | → |
| Spring Valley Creek Nr Eagle Id | 0 cfs | → |
| Boise River South Channel At Eagle Id | 1,120 cfs | → |
| Eagle Drain At Eagle | 44 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Stewart Gulch Main Fork.
Boat launches
- Robie Creek Road Boise County
- Parnell Recreation Site
- Beehive Bend
- Upper Embankment Road Canyon County
- Look Lane 21723, Canyon County
Campgrounds
- Gowen Field Military
- Shafer Butte Cg And Group Sites - Reserve - Tent
- Shafer Butte
- Macks Creek
- Arrowrock Reservoir Dispersed
- Grayback Gulch
Paddle runs
- Confluence With Granite Creek To Confluence With Pine Creek
- Boise Nf Boundary To Confluence With Willow Creek
- Trail Creek To Confluence With Crank Creek
- Boise Nf Boundary (1 Mile East Of Banks) To Boise Nf Boundary (1 Mile South Of Banks)
- Confluence With Rabbit Creek To Confluence With Middle Fork Boise River
- Boise Nf Boundary To Confluence With Payette River
Track Stewart Gulch Main Fork 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 Stewart Gulch Main Fork
Where does the data for Stewart Gulch Main Fork 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 Stewart Gulch Main Fork.