0 Occurrences
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2 Occurrences
9 Occurrences
Middle Creek left bank - Unit 5 and part of 1 Location
City, County, and State of the levee system. Determined by the
levee alignment location not the leveed area.
Upper Lake, Lake County, California
System ID
Unique identifier code for the levee system using 10 or 12 numbers
in length.
5205000273
Operation and Maintenance Organization
Entity responsible for day-to-day management of the levee.
Central Valley Flood Protection BoardLake County Watershed Protection District
Floodplain Management
Entities responsible for regulating activities that occur in
areas prone to flooding.
FEMA Region 9
Oversight Organization
Entity responsible for oversight of the levee and ensuring it
is maintained.
USACE - Sacramento District
Last Assesment Date
Last Risk Assessment or Formal Inspection.
6/23/2017
Levee Length
Combine length of all the levee system features including the
embankments, floodwalls, closures where they exist for this
system.
2.342 Miles Average Levee Height
The average height of the levee system. The levee profile viewer
on the mapping window will show the actual levee height values
for the length of the levee if available.
7 Feet Year Levee Constructed Year levee system was fully completed as a flood reduction
project.
No Data Summary
General text description of the levee system with a
summary of why the levee is there, and the benefits it
provides.
Middle Creek runs north to south through the community of Upper Lake before feeding into the north end of Clear Lake. One mile north of Highway 20, Alley Creek runs east to west before joining Middle Creek. Both streams have a history of flooding, so levees were built to help lower the risk of Upper Lake flooding from these streams. The levees were improved by the federal government in the 1960’s. On the south bank of Alley Creek, starting about a half mile east of Elk Mountain Road and continuing to Middle Creek, is the levee known as Middle Creek left bank – Unit 5. Connecting to the Alley Creek levee and continuing south along Middle Creek and wrapping around a small area about 900 feet south of Highway 20, is the levee known as Middle Creek left bank – Unit 1. These two levees form the levee system known as Middle Creek left Bank Unit 5 and Part of 1. The leveed area (flood risk area for this system) is a mixture of residential and agricultural land. The population at risk in the leveed area is about 510 people.
Performance & Condition
General text description of the historical and
anticipated performance of the levee, the people and
property benefitting from the levee and who may be at
risk of flooding, and actions to address areas of
concern.
The leveed area of this system is considered low risk. Water has never risen to the top of this levee, and there is some uncertainty about the possibility for seepage (water flowing through or under the levee soil) during large floods. If this levee breached (broke open) during a flood, it is estimated that 2 feet of water would flow overland, and water could pond at the southern end of the levee system at depths up to 5 feet. Based on the relatively low population living inside the leveed area and the exit routes available, full evacuation is expected and loss of life is not expected.
Flooding Hazard
Historic Loading by Percentage of Height
Representative loading associated with historical
flood information as a percentage of the levee height
or overtopping.
Representative loading associated with historical
flood information as a percentage of the levee height
or overtopping.
0 Occurrences
1 Occurrences
2 Occurrences
9 Occurrences