2025-12-24T22:00:00-08:00
* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of Southwest California, including the following areas, Apple and Lucerne Valleys, Coachella Valley, Orange County Coastal Areas, Orange County Inland Areas, Riverside County Mountains, San Bernardino County Mountains, San Bernardino and Riverside County Valleys-The Inland Empire, San Gorgonio Pass near Banning and Santa Ana Mountains and Foothills. * WHEN...From Tuesday afternoon through Wednesday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Mud and debris flow are possible near and in burn scars, including the Airport, Bridge and Line burn scars. * ADDITIONAL DETAILS... - An Atmospheric River will likely bring widespread moderate to heavy rain to the region late Tuesday through Wednesday. Showers could begin to develop as early as Tuesday evening, especially in the mountains. Heaviest and most widespread rain is expected Wednesday morning continuing through the afternoon in the Coachella Valley and in the mountains. Peak rainfall rates of 0.50 to 1 inch per hour are expected. There is a potential for locally heavier hourly rainfall rates to develop with convection embedded in the main rain band or in thunderstorms after the main band passes. Scattered locally heavy showers could continue into Thursday but impacts from any additional rain are expected to be more localized. -Snow levels are expected to remain above 8000 ft during period of heaviest precipitation bringing a heightened risk of mud slides, debris flow, and areas of flash flooding in the San Bernardino county mountains. - https://www.weather.gov/safety/flood
Summary
The ideal streamflow range for this river is between 200-500 cfs, with higher flows occurring during the winter months. The river is rated as a class II-III, with some sections reaching class IV during high water levels. The river spans over 30 miles, with the most popular segment being the Whitewater River Run, which covers approximately 6.5 miles.
The Whitewater River Run features several exciting rapids and obstacles, including Devil's Hole, a class III rapid with a large boulder in the center, and the Narrows, a narrow section of the river with fast-moving water and large boulders. Other notable rapids include Pinball, S-Turn, and the Elevator.
There are specific regulations in place for the Santa Margarita River, including a permit system operated by the San Diego County Parks and Recreation Department. All boaters must obtain a permit before accessing the river, and there are restrictions on the number of daily permits issued. Additionally, boaters are required to wear personal flotation devices and adhere to Leave No Trace principles.
Overall, the Santa Margarita River offers a thrilling whitewater experience for both novice and experienced boaters. However, it is important to check current streamflow levels and adhere to all regulations to ensure a safe and enjoyable trip.
River Run Details
| Last Updated | 2025-06-28 |
| River Levels | 10 cfs (2.12 ft) |
| Percent of Normal | 57% |
| Status | |
| Class Level | ii-iii |
| Elevation | ft |
| Streamflow Discharge | cfs |
| Gauge Height | ft |
| Reporting Streamgage | USGS 11044350 |
Santa Margarita River
Devil Canyon Tributary To San Mateo Creek
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