City Diversion dam
City Diversion
City Diversion is a gravity dam located in Idaho Falls, Idaho, along the Snake River. Owned by the local government and regulated by the Idaho Department of Water Resources, this dam serves a primary purpose of hydroelectric power generation and also provides recreational opportunities. Completed in 1982, City Diversion has a height of 30 feet and a length of 1970 feet, with a storage capacity of 1200 acre-feet.
Managed by the Federal Energy Regulatory Commission, City Diversion has a low hazard potential and a moderate risk assessment. The dam features an uncontrolled spillway and one other controlled outlet gate. While its condition assessment is not available, inspections are conducted every three years to ensure its safety and functionality. The dam's emergency action plan was last revised in 2019, and it meets established guidelines for response and risk management.
City Diversion plays a vital role in harnessing water resources for energy production while also offering recreational opportunities for the local community. With its strategic location along the Snake River, this dam exemplifies the intersection of water resource management, climate resilience, and sustainable infrastructure development in the state of Idaho.
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 City Diversion -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Willow Cr Floodway Channel At Mouth Nr Id Falls Id | 4 cfs | → |
| Great Western Spillback Nr Idaho Falls Id | 63 cfs | → |
| Snake River Nr Shelley Id | 4,970 cfs | → |
| Snake River Ab Eagle Rock Nr Idaho Falls Id | 5,250 cfs | → |
| Willow Creek Bl Floodway Channel Nr Ucon Id | 98 cfs | → |
| Willow Creek Floodway Channel Nr Ucon Id | 0 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near City Diversion.
Boat launches
- River Parkway Downtown
- East 1250 North Bingham County
- Bonneville County
- East Lincoln Road Bonneville County
- Menan Butte
Campgrounds
- Idaho Falls North Tourist Park
- Kepp's Crossing Dispersed Camping Area
- Jefferson County Lake
- Juniper Park - Ririe Reservoir
- Juniper Co Park
- Twin Bridges Co Park
Track City Diversion 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 City Diversion
Where does the data for City Diversion 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 City Diversion.