the local papers reads
Steady rain and continuing snow accumulation in the Sierra has prompted the Bureau of Reclamation to spill from all of their Central Valley Project
reservoirs for flood control.
New Melones on the Stanislaus River was the last Bureau dam to impose flood releases. Spilling was scheduled to have started Tuesday. Rain is expected
for the next four days with a high wind advisory through 5 p.m. today.
The Bureau had been holding back on New Melones releases due to releases coming from state and federal dams farther south along the San Joaquin
River’s watershed. The strategy effectively prevents a repeat of the January 1997 episode when heavy releases from elsewhere on the San Joaquin
River tributary system and the Stanislaus River releases hit at their confluence almost at the same time where the two rivers combine 11 miles south
of Manteca triggering nine levee breaks and subsequently 80 square miles of flooding.
Conditions are also different this time. In 1996, a heavy December snowpack unexpectedly started melting when unseasonably warm weather occurred at
the end of the month and on into early 1997 to rapidly fill New Melones. There were concerns the dam could be breached. It also was not raining in the
valley but was dry and sunny.
New Melons as of Wednesday had only 567,000 acres feet of storage left in the 2.4-million acre-foot reservoir with increasing inflows. On top of that,
the Department of Water Resources reported Tuesday that the projected runoff into New Melones between April and July will be between 630,000 and
1,120,000 acre feet.
Water level at Vernalis south of Manteca near the confluence of the Stanislaus and San Joaquin rivers was at 20.69 feet Wednesday at 11 p.m. Flood
stage is 24.5 feet. The highest recorded level was 34.9 feet on Jan. 5, 1997.
The state started emergency levee repairs in January along the San Joaquin River near Durham Ferry in anticipation of a big spring run-off. Crews
worked 24/7 to strengthen the levee that has failed a number of times since 1929.
The same stretch of levee also was stressed significantly in May of 2006. The levees were strengthened back then as well. No flooding occurred,
though.
It is one of nine spots south of Manteca that failed during January of 1997 along the Stanislaus and San Joaquin rivers triggering the flooding of 80
square miles. There was $100 million in property damages, 2,000 people were evacuated, 20,000 head of cattle were relocated, and 800 homes and other
structures sustained some form of water damage.
The northern Sierra that feeds the Sacramento River that has a much wider channel plus a series of bypasses is at 115 percent of normal in terms of
the snowpack. The southern Sierra that runs off into the San Joaquin River, though, is at 140 percent of normal. The San Joaquin River channel lacks
bypasses, has a narrower channel, and has more levees under stress.
The weakest part on the entire San Joaquin River section is just south of Manteca.
The area south of Manteca has flooded 11 times since 1929.
The biggest recorded flood in modern South County history started in 1950. It caused flooding west of present-day Interstate 5 in Lathrop. Flood
waters threatened San Joaquin County Hospital and came within four miles of downtown Manteca. There were 2,000 people evacuated. Today, if the same
flooding occurred, it would force 20,000 people to flee.
www.mantecabulletin.com...
Like i said i been paying attention the facts... the fact is there is a WHOLE lot of water locked up in snowpack in the sierra nevada mountains... no
doubt about it... These guys better start releasing a whole lot more water... screw the farmers , screw Southern Californians for moving into a
Desert... Let that water out of the dam... and dont stop... because Come spring snow runoff... all that water has to go somewhere...and My family just
happens to live downstream of their water storage/flood control reservoirs... and if it does flood here it will be because dickhead politicians and
wealthy farmers responsible for pushing around those in charge at the bureau of reclamation... holding on to water they didnt need to.