CALIFORNIA FLOW REPORT

Last Updated: December 23, 2025

California's river systems are currently exhibiting varied streamflow conditions, with certain areas facing significant deviations from normal flow levels. Notably, the Upper Truckee River near Meyers and the Prosser Creek below Prosser Creek Dam near Truckee are experiencing exceptionally high streamflows, with percentages of normal streamflow exceeding 450% and 770%, respectively. These figures point toward the potential for spring snowmelt flooding, particularly in the Truckee River Basin, which is a crucial watershed not only for local ecosystems but also for recreational activities such as whitewater rafting. Conversely, Southern California's San Joaquin River near Mendota is experiencing notably low streamflows, at only 1.8% of its normal, indicating drought conditions that could affect agricultural water supply and ecosystems.

Among the largest increases in streamflow in the last 24 hours, the Yuma Main Canal at Siphon Drop near Yuma reported an uptick of nearly 178 cfs, while the Prosser Creek near Truckee surged by approximately 366 cfs, suggesting rapid changes that could impact surrounding communities and recreational river use. In contrast, the Colorado River below Parker Dam shows a substantial decrease of over 30 cfs, with streamflow at only 38.68% of its normal, which may implicate water availability downstream. Cities like Sacramento are also facing variations, with the Sacramento River near Rio Vista experiencing a significant rise in streamflow. As river enthusiasts plan for activities, the high streamflows in the Truckee River may attract whitewater adventurers, while those who frequent the San Joaquin watershed may need to reconsider their plans due to low water levels. It's crucial for residents and visitors to stay informed about the changing river conditions, as they could impact water sports, wildlife habitats, and flood risk management.

       



California has a diverse hydrological system with major surface flows, including the Sacramento and San Joaquin River systems, which provide water to the agricultural heartland. The state has numerous reservoirs and dams, including the Oroville Dam, which is the tallest in the US. California's climate is characterized by long periods of drought, punctuated by occasional heavy rainfall events. The state's hydrology is heavily influenced by snowpack, which accumulates in the Sierra Nevada mountains during the winter and provides a critical source of water during the dry season. The state's watersheds are also important, with the Sacramento River being the largest, providing water to much of Northern California. Overall, California's water management is complex and requires careful planning to balance the competing demands of agriculture, urban areas, and the environment.


       

Winter Storm Warnings

December 23 2025

Residents across California are urged to prepare for a series of significant natural threats as a winter storm watch, high wind warnings, flood watches, and beach hazards impact the state. Heavy snow with accumulations of 1 to 2 feet and wind gusts up to 55 mph are expected in Trinity County, while the southern Humboldt region, Del Norte, and the Northern Humboldt Coast face southeast winds reaching 70 mph. The Sacramento Valley, Motherlode, Northeast Foothills, and Northern San Joaquin Valley anticipate south winds up to 60 mph, possibly downing trees and power lines. Additionally, a flood watch extends through the Northern San Francisco Bay Area, including Napa, Sonoma, Marin, San Francisco Counties, the Peninsula, East Bay, South Bay, and Central Coast, with potential for flooding of rivers and urban areas. Coastal regions are warned of strong winds causing blowing sand and reduced visibility. Residents, especially in these areas, should follow safety protocols, avoid travel if possible, and prepare for power outages and potential evacuations.


Rafting & Kayaking

River Run Status Streamflow (CFS) Air Temp (F)
Chamberlain Falls (Iowa Hill to Yankee Jim)
Class IV to V-
45.52
Chili Bar
Class III to IV
RUNNABLE 1390 65
Coloma to Greenwood - (C to G)
Class II to III-
RUNNABLE 1390 65
Generation and Giant Gaps (Tadpole to Colfax-Iowa Hill Road)
Class IV to IV+
RUNNABLE 1390 65
Gold Creek to Three Pools (Opal Creek Run)
Class IV to V-
51.55
Greenwood to Mammoth Bar
Class II to II+
RUNNABLE 1390 65
Interbay to Oxbow (End of the World)
Class IV to V
42.19
Iron Gate Dam to Happy Camp
Class II to III
RUNNABLE 2550 51
Royal Gorge (Soda Springs to Tadpole Creek)
Class V to V+
RUNNABLE 817 51
Sandy Flat Camp to Democrat Picnic Area
Class IV to IV+
54.16
Sluice Box to Green Riffle
Class III- to IV
RUNNABLE 3690 48
Sunrise Avenue to Watt Avenue
Class II- to II
TOO HIGH 1020 63
Tahoe City to River Ranch
Class I
323 46
The Gorge
Class III to III+
48.74
Tunnel Run (Ralston Powerhouse to Greenwood)
Class IV- to IV
RUNNABLE 1390 65
Yankee Jim Road to Ponderosa Way (Shirttail)
Class II to III
RUNNABLE 1390 65
       
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