Logan First Dam dam
Logan First Dam
Logan First Dam, located in Cache, Utah, along the Logan River, was completed in 1914 and serves as a vital hydroelectric structure for the region. Owned by the local government, this buttress-type dam stands at a structural height of 30 feet and has a hydraulic height of 22 feet. With a normal storage capacity of 70 acre-feet and a maximum storage of 140 acre-feet, the dam plays a crucial role in managing water resources in the area.
Maintained and regulated by the Utah Division of Water Rights, Logan First Dam has a high hazard potential but is currently assessed to be in satisfactory condition. The dam undergoes regular inspections, with the last one conducted in May 2020. While it does not have an Emergency Action Plan (EAP) in place, the structure meets regulatory guidelines and serves as a key component in the region's water management infrastructure. With its rich history and continued importance in water resource management, Logan First Dam remains a significant asset for the community and a symbol of sustainable hydroelectric power generation.
As a key feature along the Logan River, Logan First Dam contributes to the efficient utilization of the river's resources while also providing critical hydroelectric power for the area. With its impressive design and functionality, the dam stands as a testament to the engineering ingenuity of its time. The local government's ownership and the Utah Division of Water Rights' oversight ensure that the dam continues to operate safely and effectively, playing a crucial role in water resource management and climate resilience efforts in Cache, Utah.
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 Logan First Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Logan River Above State Dam | 410 cfs | → |
| Logan | 68 cfs | → |
| Blacksmith Fork Ab U.P.&L. Co | 74 cfs | → |
| Little Bear River At Paradise | 83 cfs | → |
| Bear River Near Corinne | 411 cfs | → |
| Bear River At Idaho-Utah State Line | 483 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Logan First Dam.
Boat launches
- North 3000 West Cache County
- Highway 30 Cache County
- West 3000 North 4507, Cache County
- West 6200 North 6484, Cache County
- Highway 102 Box Elder County
- Promontory Road Corinne
Campgrounds
- Bridger Campground
- Logan, Free Camping
- Spring Hollow Campground
- Guinavah - Malibu Campground
- Preston Valley Campground
- Wood Camp Campground
Track Logan First Dam 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 Logan First Dam
Where does the data for Logan First Dam 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 Logan First Dam.