A low pressure system spread moisture into Merced County and into Yosemite Park on on the evening of February 9. This system moved southward on the morning of the 10th spreading heavy precipitation across the Yosemite Park area, the Mariposa County foothills and the rural areas of Merced County to the southeast of Merced. Some thunderstorms broke out that afternoon bringing additional heavy rainfall to the central San Joaquin Valley. Snow levels were around 8000 feet on the 10th lowering to around 6500 feet in Yosemite Park on the afternoon of the 11th in a cooler and showery airmass.

Flash Flood in MARIPOSA, CALIFORNIA
From 10-FEB-17 22:00:00 to 10-FEB-17 22:00:00 (PST-8)
Location: CATHAY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Mariposa Dam reached capacity and was being over-topped. Army Corps of Engineers was releasing water down the emergency spillway.

Flood in MARIPOSA, CALIFORNIA
From 10-FEB-17 14:46:00 to 10-FEB-17 14:46:00 (PST-8)
Location: BRICEBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported large boulders in the roadway on both lanes of Highway 140 near Bug Hostle and Octagon southeast of Briceburg.

Flood in MERCED, CALIFORNIA
From 10-FEB-17 15:57:00 to 10-FEB-17 15:57:00 (PST-8)
Location: LE GRAND
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported a vehicle stuck in large amount of water and mud on Cunningham Road near Santa Fe Avenue in LeGrand.

Flood in MERCED, CALIFORNIA
From 10-FEB-17 22:32:00 to 10-FEB-17 22:32:00 (PST-8)
Location: LE GRAND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported roadway flooding on White Rock Road northeast of LeGrand.

Heavy Snow in S SIERRA MTNS, CALIFORNIA
From 10-FEB-17 09:14:00 to 11-FEB-17 09:14:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

COOP station at Tuolumne Meadows reported a measured 24 hour snowfall of 12 inches in Tuolumne County at an elevation of 8,694 feet. Also reported a snow depth of 126 inches.

Debris Flow in TUOLUMNE, CALIFORNIA
From 10-FEB-17 05:20:00 to 10-FEB-17 05:20:00 (PST-8)
Location: HARDEN FLATS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported a rock slide due to heavy rainfall on Highway 140 east of Ferguson Bridge about 5 miles north northwest of Midpines.

Debris Flow in KERN, CALIFORNIA
From 11-FEB-17 10:29:00 to 11-FEB-17 10:29:00 (PST-8)
Location: LEBEC
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported 5 to 6 football sized rocks in the southbound lane of Interstate 5 near Lebec.

Debris Flow in FRESNO, CALIFORNIA
From 11-FEB-17 10:31:00 to 11-FEB-17 10:31:00 (PST-8)
Location: PIEDRA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported a debris flow blocking both lanes on east Trimmer Springs Road near Piedra Road in Piedra.

Debris Flow in KERN, CALIFORNIA
From 11-FEB-17 10:46:00 to 11-FEB-17 10:46:00 (PST-8)
Location: MARICOPA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported large boulders blocking westbound lanes from heavy rainfall of Highway 33 near Soda Lake Road about 13 miles south of Taft.

Heavy Rain in MARIPOSA, CALIFORNIA
From 09-FEB-17 07:45:00 to 10-FEB-17 07:45:00 (PST-8)
Location: ELLIOTT CORNER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained Spotter near Ponderosa Basin in Mariposa County reported a 24 hour rainfall total of 1.66 inches. Also reported a season total of 55.56 inches.

Flood in MERCED, CALIFORNIA
From 10-FEB-17 10:39:00 to 10-FEB-17 13:39:00 (PST-8)
Location: PLANADA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported both lanes on Highway 140 near North Cunningham Road were affected from moderate to heavy rain for the previous 2 to 3 hours.

Flood in MARIPOSA, CALIFORNIA
From 10-FEB-17 14:17:00 to 10-FEB-17 14:17:00 (PST-8)
Location: MT BULLION
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported one lane partially blocked due to debris on Highway 140 near Mt. Bullion Cut Off Road.

Flood in MARIPOSA, CALIFORNIA
From 10-FEB-17 14:22:00 to 10-FEB-17 14:22:00 (PST-8)
Location: MARIPOSA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported a stranded vehicle on Guadalupe Creek Road near Yaqui Gulch Road with 100 feet of flood water running on both sides.

Flood in MADERA, CALIFORNIA
From 10-FEB-17 17:36:00 to 10-FEB-17 17:36:00 (PST-8)
Location: MADERA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported roadway flooding on Road 26 at Avenue 17 in Madera Acres.

Flash Flood in MERCED, CALIFORNIA
From 10-FEB-17 23:59:00 to 10-FEB-17 23:59:00 (PST-8)
Location: LE GRAND
Flood cause: Dam / Levee Break
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

County emergency manager reported flooding in eastern Le Grand due to Mariposa Dam over topping its emergency spillway.