Holbrook dam
Holbrook
Holbrook, located in Ash Valley, California, is a privately owned dam that serves multiple purposes including flood risk reduction, irrigation, and water supply. Built in 1952, this earth dam stands at a height of 26 feet and has a storage capacity of 719 acre-feet, providing essential water resources for the region. The dam is situated on Ash Creek and has a drainage area of 14 square miles, with a surface area of 122 acres.
Managed by the California Department of Water Resources and regulated by the Safety of Dams agency, Holbrook is in a satisfactory condition with low hazard potential. Despite being a smaller dam, it plays a crucial role in mitigating flood risks and ensuring water availability for agricultural and residential needs in the area. The dam underwent its last inspection in August 2020, with a planned inspection frequency of once per year to ensure its continued functionality and safety.
Overall, Holbrook serves as a vital infrastructure in Lassen County, California, contributing to the region's water resource management and climate resilience efforts. With its strategic location and multiple purposes, the dam plays a significant role in supporting the local community's water supply needs and protecting against potential flooding events. Continuous monitoring and maintenance efforts ensure that Holbrook remains a reliable asset for water storage and flood risk reduction in the area.
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 Holbrook -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Sf Pit R Nr Likely Ca | 120 cfs | → |
| Pit R Nr Canby Ca | 4 cfs | → |
| Pit R Bl Pit No 1 Ph Nr Fall River Mills Ca | 1,040 cfs | → |
| Hat C Nr Hat Creek Ca | 169 cfs | → |
| Burney C A Burney Falls Nr Burney Ca | 168 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Holbrook.
Campgrounds
- Ash Creek
- Ash Creek Campground
- Red Tail Rim Trail South Trailhead
- Red Tail Rim South
- Red Tail Rim Trail South Trailhead/Campground
- Blue Lake Campground
Fishing spots
Paddle runs
- Begins Near Muck Valley To Ends Two Miles From The Fall River Valley
- Upper Pit River Canyon
- Begins 2.5 Miles West Of Little Valley, California To Juncture With The Pit River.
- Lower Horse Creek Canyon
- Smoke Creek
- 1.5 Miles Downstream From Big Spring To Extends To Smoke Creek Reservoir
More reservoirs
Track Holbrook 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 Holbrook
Where does the data for Holbrook 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 Holbrook.