Weymouth Memorial Reservoir dam
Weymouth Memorial Reservoir
Located in La Verne, California, the Weymouth Memorial Reservoir is a vital public utility structure designed for water supply purposes. Constructed in 1966, this offstream dam stands at 18 feet in height and spans 2400 feet in length, with a storage capacity of 151 acre-feet. Managed by the Department of Water Resources (DWR) and regulated by the Safety of Dams agency, the reservoir plays a crucial role in ensuring a sustainable water source for the surrounding community.
With a high hazard potential and a satisfactory condition assessment as of September 2017, the Weymouth Memorial Reservoir is regularly inspected to maintain its safety and integrity. The dam is equipped with outlet gates and has a maximum discharge capacity, although specific spillway details are not provided. The reservoir's emergency action plan (EAP) status and risk management measures remain unspecified, emphasizing the importance of ongoing monitoring and preparedness to mitigate any potential risks or emergencies.
The Weymouth Memorial Reservoir, nestled in the picturesque landscape of Los Angeles County, serves as a key component of the region's water infrastructure. As climate change continues to impact water resources, this reservoir underscores the importance of sustainable water management practices and proactive measures to safeguard against potential hazards. Enthusiasts of water resources and climate resilience will find the Weymouth Memorial Reservoir to be a fascinating example of infrastructure designed to meet the challenges of a changing environment.
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 Weymouth Memorial Reservoir -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| San Antonio C A Riverside Dr Nr Chino Ca | · | → |
| Chino C A Schaefer Avenue Nr Chino Ca | 1 cfs | → |
| San Gabriel R Bl Santa Fe Dam Nr Baldwin Pk Ca | 141 cfs | → |
| Cucamonga C Nr Mira Loma Ca | 15 cfs | → |
| Carbon C Bl Carbon Cyn Dam Ca | · | → |
| San Gabriel R Ab Whittier Narrows Dam Ca | 9 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Weymouth Memorial Reservoir.
Boat launches
Campgrounds
Fishing spots
- Puddingstone Reservoir
- Puddingstone Lake
- Santa Fe Dam
- Cucamonga-Guasti Regional Park Lake
- Mt Baldy Trout Pools
- Peck Road Park Lake
Paddle runs
- Laurel Gulch To Confluence With Mineo Canyon (Se 1/4, Sw 1/4, Sec 17, T2n, R8w)
- 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)
- 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)
- 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)
- Middle Fork - Commanche Campsite To Middle Fork Trailhead
- Cooper Canyon- Near State Highway 2 (Sw 1/4, Ne 1/4, Sec 16, T3n, R10w To Confluence With Little Rock Creek
Track Weymouth Memorial Reservoir 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 Weymouth Memorial Reservoir
Where does the data for Weymouth Memorial Reservoir 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 Weymouth Memorial Reservoir.