SNOFLO


NEW HOGAN LAKE

RESERVOIR LEVELS USBR NHG
May 9, 2025


90°F

Today

61°F

Tonight

4mph

Windspeed

43%

Humidity

New Hogan Dam, located in California along the Calaveras River, serves as a crucial flood risk reduction structure that provides multiple benefits to the surrounding communities. Completed in 1963 by the US Army Corps of Engineers, this rockfill dam stands at a height of 210 feet and has a storage capacity of up to 348,598 acre-feet. While the dam has historically performed well in reducing the risk of flooding to downstream areas, a 2006 risk assessment highlighted potential concerns, such as the lack of spillway adequacy and the possibility of dam deformations during a major earthquake.

To manage these risks, USACE closely collaborates with local emergency managers, regularly updates emergency action plans, and conducts drills to enhance preparedness. The full-time staff at New Hogan Dam ensures regular maintenance and immediate inspections in case of any unusual events. By incorporating weather forecasts and monitoring localized flows, USACE can make informed decisions on dam operations to mitigate potential threats to downstream communities. While the scenarios of dam failure are considered extremely unlikely, the emergency action plan for New Hogan Dam is in place to lower the risk of life loss and protect the surrounding infrastructure from significant flooding impacts.

Storage 24hr Change -0.25%
Percent of Normal 120%
Minimum 23,499 acre-ft
2015-12-18
Maximum 311,058 acre-ft
2006-04-05
Average 180,028 acre-ft
Dam_Height 155
Hydraulic_Height 195
Drainage_Area 363
Year_Completed 1963
Nid_Storage 317100
Structural_Height 210
Primary_Dam_Type Rockfill
Surface_Area 4400
River_Or_Stream CALAVERAS RIVER
Dam_Length 1960
Hazard_Potential High
Nid_Height 210
       
Seasonal Comparison
Created with Highcharts 8.0.0Seasonal Water Storage(acre-ft)1. Jan1. Feb1. Mar1. Apr1. May1. Jun1. Jul1. Aug1. Sep1. Oct1. Nov1. Dec0100k200k300k
Storage Levels
Created with Highcharts 8.0.0Storage (acre-ft)15. Jan29. Jan12. Feb26. Feb11. Mar25. Mar8. Apr22. Apr6. May20. May3. Jun17. Jun1. Jul0100k200k300k
Pool Elevation Levels
Created with Highcharts 8.0.0Pool Elevation (ft)15. Jan29. Jan12. Feb26. Feb11. Mar25. Mar8. Apr22. Apr6. May20. May3. Jun17. Jun1. Jul0250500750

Weather Forecast

Created with Highcharts 8.0.0humidity0.04"0.04"Sat May 10Sun May 11Mon May 12Tue May 13Wed May 1464°128°192°0%120%60%180%