Mary Street dam
Mary Street
Mary Street is a vital flood risk reduction structure located in Casa Blanca, California, along the Alessandro Wash. Owned by the local government, this earth dam stands at a height of 40 feet and was completed in 1981. With a storage capacity of 320 acre-feet and a drainage area of 6.7 square miles, Mary Street plays a crucial role in mitigating potential flooding events in the region.
Regulated by the California Department of Water Resources for dam safety, Mary Street has a high hazard potential but is currently assessed to be in satisfactory condition. Regular inspections ensure its structural integrity, with the last assessment conducted in September 2017. In the event of an emergency, the dam has emergency action plans in place, although the details of their preparation and adherence to guidelines are not specified in the data. Overall, Mary Street serves as a key infrastructure for water resource management and climate resilience in Riverside County.
Represented in Congress by Mark Takano, Mary Street is part of the flood risk reduction infrastructure under the jurisdiction of the Los Angeles District of the US Army Corps of Engineers. Its location at the confluence of multiple waterways highlights its strategic importance in protecting surrounding communities from potential inundation. As climate change continues to impact precipitation patterns and increase the frequency of extreme weather events, the maintenance and proper management of structures like Mary Street are essential for safeguarding lives and property in the region.
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 Mary Street -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Santa Ana R A E St Nr San Bernardino Ca | 2 cfs | → |
| San Timoteo C Nr Loma Linda Ca | 3 cfs | → |
| Lytle C A Colton Ca | · | → |
| Warm C Nr San Bernardino Ca | · | → |
| Temescal C Ab Main St A Corona Ca | 2 cfs | → |
| Cucamonga C Nr Mira Loma Ca | 19 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mary Street.
Boat launches
- Vacation Drive 28736, Canyon Lake
- Goetz Road Riverside County
- Pacific Crest Trail, Hesperia
- Eucalyptus Park Road, San Dimas
- Warren Road 37701, Temecula
Campgrounds
- Rancho Jurupa Park
- March Arb Military
- Lake Perris State Rec Area
- Prado Regional Park
- Lake Elsinore
- Glen Helen Regional Park
Fishing spots
- Lake Evans
- Perris Lake
- Corona Lake
- Secombe Lake
- Cucamonga-Guasti Regional Park Lake
- Prado Regional Park, El Lake
Paddle runs
- San Mateo Wilderness Boundary To Nf Boundary With Camp Pendleton
- Middle Fork - Commanche Campsite To Middle Fork Trailhead
- Below Deep Creek Lake To Below 2w01 Crossing
- Filaree Flat To Confluence With Bear Creek
- Big Bear Dam To Private Land In Sec 19, T1n, R1w
- Big Meadows To Filaree Flat
More reservoirs
Track Mary Street 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 Mary Street
Where does the data for Mary Street 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 Mary Street.