Cross Cut Diversion dam
Cross Cut Diversion
The Cross Cut Diversion, also known as Chester Dam, is a private water structure located in St. Anthony, Idaho. Completed in 1938, this concrete dam serves primarily for irrigation purposes along the Henrys Fork and Snake River. With a height of 17.5 feet and a storage capacity of 250 acre-feet, the dam helps manage water resources in the region and supports agricultural activities in the area.
Owned and regulated by private entities in Idaho, the Cross Cut Diversion is classified as a low hazard structure with a satisfactory condition assessment. The dam features an uncontrolled spillway with a width of 355 feet and a drainage area of 1752 square miles. While the risk assessment for the dam is moderate, regular inspections and enforcement ensure its safe operation and minimal environmental impact. Water resource and climate enthusiasts will find the Cross Cut Diversion an essential component of the region's water management infrastructure, contributing to sustainable agriculture and environmental stewardship along the Snake River.
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 Cross Cut Diversion -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Falls River Nr Chester Id | 884 cfs | → |
| Henrys Fork Nr Ashton Id | 979 cfs | → |
| Henrys Fork At St Anthony Id | 898 cfs | → |
| Teton River Nr St Anthony Id | 1,100 cfs | → |
| Falls River Nr Ashton Id | 1,300 cfs | → |
| Nf Teton River Nr Sugar City Id | 125 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Cross Cut Diversion.
Boat launches
- Trestle Bridge
- Red Road Bridge Boat Access
- East Hatchery Ford Boating Site
- Riverside Campground Road Fremont County
- Lorenzo Boat Access
- Old Highway Island Park
Campgrounds
Fishing spots
Track Cross Cut 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 Cross Cut Diversion
Where does the data for Cross Cut 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 Cross Cut Diversion.