Berryessa Snow Mountain National Monument
Cold Weather Advisory issued December 29 at 9:51PM PST until December 30 at 9:00AM PST by NWS San Francisco CA
* WHAT...Cold conditions with temperatures as low as 36 expected. * WHERE...Interior Monterey County and the Santa Lucia Range, Most of San Benito County and the Cholame Hills in Southeast Monterey County, North Bay Interior Mountains, Eastern Santa Clara Hills, East Bay Hills, and Southern Salinas Valley/Arroyo Seco and Lake San Antonio. * WHEN...From 1 AM to 9 AM PST Tuesday. * IMPACTS...Cold conditions will be hazardous to sensitive populations such as unhoused individuals. Prolonged exposure to the cold conditions will lead to hypothermia for people, pets, and livestock. Cold conditions may damage or kill sensitive crops, plants, and vegetation if appropriate precautions are not taken.
Hydrologic Outlook issued December 29 at 9:26PM PST by NWS Eureka CA
ESFEKA A series of atmospheric rivers will bring an increased risk for urban and small stream flooding late this week and into this weekend. The first round of rain will arrive Wednesday night into Thursday and provide generally light to moderate rainfall amounts. Locally heavy rain is expected in the King Range. This initial period of rain will set the stage for a more intense rainstorm expected to arrive Friday into Friday night. Current indications are for the heaviest rainfall to occur during the day on Friday into Friday night. The greatest risk for small stream flooding will occur during this time period and probably continue into Saturday after heavy rain has ended due to the lag in rainfall run-off. Road closures will be possible. At this point, the area of greatest concern is in southern Humboldt and northwest Mendocino counties. Small rivers, streams and creeks such as Elk river, Jacoby creek and Mattole river could exceed their banks and flood area roads. Southern Mendocino and Lake counties may also experience heavy rain and road flooding will be possible. Mainstem rivers will also likely rise sharply and will need to be monitored for possible flood stage exceedance. Be on the lookout for watches, advisories and warning as this next heavy rain event unfolds. Stay alert and remember to never attempt to drive through water covered roads. Water may be moving much faster than you think.
Dense Fog Advisory issued December 29 at 4:36PM PST until December 30 at 12:00PM PST by NWS Sacramento CA
* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Central Sacramento Valley, Northern San Joaquin Valley, and Southern Sacramento Valley. * WHEN...From 2 AM to noon PST Tuesday. * IMPACTS...Low visibility could make driving conditions hazardous.
Wet weather trail closure in effect on Grindstone District
A wet weather closure is in effect for Stonyford OHV trails on the Grindstone Ranger District, as of 10am, Dec. 23. Trail closures go into effect when two inches of rainfall occur within a 24-hour period or when the soils are saturated.
Wet weather trail closure in effect on Upper Lake District
A wet weather closure will go in effect for OHV trails on the Upper Lake Ranger District, as of 8am on Dec. 20, 2025. Trail closures go into effect when two inches of rainfall occur within a 24-hour period or when the soils are saturated.
Stonyford Office Hours Changing
The Stonyford Office's visitor services hours are changing beginning Jan. 5, 2026. Starting next year, the office will be open from Monday-Friday and closed Saturday-Sunday. Office hours are 8:30-4pm with a lunch break 12-1pm.
M10 Road Construction
The M10 road will be closed Monday, Nov. 17- 20, 2025. Closure location is above Fouts Springs near Dixie Glade. Main impacts are to the Letts Lake basin on Grindstone Ranger District. Detour to get to Letts Lake is via the M5 and 17N02 Roads, high clearance vehicle recommended.
Trail 34 on Upper Lake District closed due to unsafe conditions
OHV Trail 34 is closed due to trail tread degradation and rutting that runs 300 feet down the trail. The trail is unsafe due to unstable soil, extremely muddy conditions and increased runoff.
Trail 3 on Grindstone closed due to slide
Trail 85303 (Trail 3) on the Grindstone Ranger District closed due to landslide: Trail 85303 is closed between Trail 85304 and M5 Road for public safety and to protect natural resources. Unstable soil, downed trees and a steep drop off make this trail unsafe for users.
Cedar Camp Campground Closure
Cedar Camp Campground is closed for public safety. Closure is in effect through 6/18/26.
Chico Seed Orchard Public Use and Access Closure
Pets must be on a leash. Fall/winter hours are 7 a.m. - 5 p.m. beginning Nov. 1. Spring/summer hours are 7 a.m. - 7 p.m. A closure is in effect outside of these hours.
Overview
Berryessa Snow Mountain National Monument encompasses 344,476 acres of some of northern California's most scenic and biologically diverse landscapes, spanning from rolling oak-studded hillsides to steep creek canyons with peaks reaching over 7,000 feet. Originally designated by President Obama in July 2015, the monument was expanded by 13,696 acres in May 2024 by President Biden to include Molok Luyuk (Condor Ridge), an 11-mile ridgeline. The monument is jointly managed by the BLM (147,262 acres) and U.S. Forest Service (197,214 acres). It offers diverse recreation including hiking, Cache Creek whitewater rafting, OHV use at Knoxville Recreation Area, primitive camping, hunting, and mountain biking. The area is known for its unique serpentine soils that support specially adapted plant communities. Three wilderness areas are within or adjacent to the monument: Cache Creek Wilderness (centered on a 17-mile stretch of Cache Creek), Cedar Roughs Wilderness (accessible only by boat, no developed facilities), and Yuki Wilderness (adjacent to the northern boundary). The monument is open year-round but may be subject to seasonal fire restrictions. Note that a current government shutdown may affect website updates and agency responsiveness. Access can be challenging in some areas due to surrounding private lands—consult current maps and field offices for route planning.
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