Twin Lakes South dam
Twin Lakes South
Twin Lakes South is a privately owned irrigation dam located in Bear River Confluence, Idaho. Built in 1920, this earth dam stands at a height of 35.5 feet and has a hydraulic height of 31 feet, with a storage capacity of 14,000 acre-feet. Despite its age, the dam's condition is assessed as satisfactory, with a high hazard potential due to its location near the Deep Creek and Bear River.
The dam does not have a spillway, and water is controlled through slide gates. The last inspection in November 2020 deemed the structure to be in good condition. However, due to its high-risk potential, it is crucial for regulatory agencies like IDWR to continue regular inspections and maintenance to ensure the safety of surrounding communities and the integrity of the dam. Twin Lakes South serves a vital purpose in irrigation, making it a key water resource in the area.
With its historical significance and essential role in water management, Twin Lakes South highlights the intersection of water resource management and climate resilience. As climate change poses increasing challenges to water availability and infrastructure safety, the proper regulation and maintenance of dams like Twin Lakes South become even more critical. By staying vigilant in monitoring and addressing potential risks, stakeholders can ensure the continued functionality and safety of this important irrigation structure for years to come.
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 Twin Lakes South -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Bear River At Idaho-Utah State Line | 656 cfs | → |
| Portneuf River At Topaz Id | 203 cfs | → |
| Logan River Above State Dam | 405 cfs | → |
| Logan | 65 cfs | → |
| Marsh Creek Nr Mccammon Id | 22 cfs | → |
| Bear River At Pescadero | 502 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Twin Lakes South.
Boat launches
- West 6200 North 6484, Cache County
- North 3000 West Cache County
- West 3000 North 4507, Cache County
- Highway 30 Cache County
Campgrounds
- Third Creek Group Campground
- Heart Mountain Spring
- Heart Mountain Springs Recreation Site
- Redpoint Recreation Site
- Dry Canyon Campground
- Dry Canyon
Track Twin Lakes South 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 Twin Lakes South
Where does the data for Twin Lakes South 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 High 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 Twin Lakes South.