South Junction dam
South Junction
South Junction is a privately-owned irrigation structure located in Box Elder, Utah, specifically in the city of Lynn. Managed by the Utah Division of Water Rights, this dam on South Junction Creek was completed in 1958 and serves the primary purpose of irrigation. With a height of 47 feet and a hydraulic height of 44 feet, it has a storage capacity of 865 acre-feet, making it a significant water resource in the area.
Designed by the USDA NRCS, South Junction is regulated, permitted, inspected, and enforced by the state of Utah, ensuring its safety and compliance with water management regulations. The dam is situated in a strategic location with a drainage area of 6.2 square miles, providing vital water supply for agricultural activities in the region. Despite being marked as having a significant hazard potential, its condition assessment is currently not rated, highlighting the need for further evaluation and potential risk management measures.
Located within the Sacramento District, South Junction plays a crucial role in water resource management and climate adaptation efforts in the area. With its historical significance dating back to the mid-20th century, this earth dam stands as a testament to the importance of sustainable water infrastructure for supporting agriculture and local communities. As water enthusiasts and climate advocates continue to monitor and assess the dam's condition, it remains a focal point for ensuring water security and resilience in the face of changing environmental conditions.
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 South Junction -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Dunn Creek Near Park Valley | 2 cfs | → |
| Raft River Ab Onemile Creek Nr Malta Id | 2 cfs | → |
| Goose Creek Ab Trapper Creek Nr Oakley Id | 2 cfs | → |
| Trapper Creek Nr Oakley Id | 23 cfs | → |
| Snake River Gaging Station At Milner Id | · | → |
| Salmon Falls Creek Nr San Jacinto Nv | 23 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near South Junction.
Track South Junction 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 South Junction
Where does the data for South Junction 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 South Junction.