Chino Ranch #1 dam
Chino Ranch #1
Chino Ranch #1, also known as Arnold Reservoir, is a local government-owned water storage facility located in Brea, California. Built in 1918, this earth dam structure stands at a height of 22 feet and has a hydraulic height of 17.5 feet. With a storage capacity of 137 acre-feet, this reservoir primarily serves the purpose of water supply for irrigation and other needs in the area.
Managed by the California Department of Water Resources, Chino Ranch #1 is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and functionality. The dam is situated along the Tonner Canyon Creek in San Bernardino County and has a significant hazard potential. Despite this, the condition assessment deemed it satisfactory as of September 2017, with regular inspections conducted to monitor its structural integrity.
The reservoir covers a surface area of 20 acres and has a maximum discharge capacity, although specific spillway details are not provided in the data. With its rich history and crucial role in water resource management, Chino Ranch #1 stands as a key infrastructure for water supply in the region, highlighting the importance of sustainable practices and climate resilience in maintaining such critical water resources.
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 Chino Ranch #1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Chino C A Schaefer Avenue Nr Chino Ca | 1 cfs | → |
| San Antonio C A Riverside Dr Nr Chino Ca | · | → |
| Carbon C Bl Carbon Cyn Dam Ca | · | → |
| Fullerton C Bl Fullerton Dam Nr Brea Ca | 1 cfs | → |
| Brea C Bl Brea Dam Nr Fullerton Ca | 0 cfs | → |
| Cucamonga C Nr Mira Loma Ca | 15 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Chino Ranch #1.
Boat launches
Campgrounds
- Chino Hills - State Park
- Bohelli Regional Park
- Prado Regional Park
- Big Dalton Campground
- Dad's Camping
- Lower Bear Cyn
Fishing spots
- Puddingstone Lake
- Puddingstone Reservoir
- Prado Regional Park, El Lake
- Tri-City Park Lake
- Anaheim Lake
- Santa Ana River Lakes
Paddle runs
- Laurel Gulch To Confluence With Mineo Canyon (Se 1/4, Sw 1/4, Sec 17, T2n, R8w)
- Gaging Station Below Spillway Of Cogswell Dam (Ne 1/4, Se 1/4, Sec 19, T2n, R10w) To Confluence With Nf San Gabriel River (Sw 1/4.Sw 1/4, Sec 15, T2n, R9w)
- North Fork - Confluence Of Soldier And Coldbrook Creeks (Se1/4,Sw1/4, Sec) 5, T2n,,R9w To Conflluence With West Fork Of San Gabriel (Sw 1/4,Sw1/4, Sec 17, T2n, R8w)
- Middle Fork - Commanche Campsite To Middle Fork Trailhead
- East Fork - Confluence Of Vincent Gulch And Prairie Fork (Nw 1/4, Sw 1/4 Sec 16 ) To Laurel Gulch (Nw 1/4, Sw 1/4, Sec 17, T2n, R8w)
- West Fork - Headwaters (Se 1/4, Ne 1/4, Sec 14, T2n, R12w) To Cogswell Reservoir (Ne 1/4, Sw 1/4, Sec 24, T2n, R9w
Track Chino Ranch #1 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 Chino Ranch #1
Where does the data for Chino Ranch #1 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 Chino Ranch #1.