Levees / California / 5305000070

Napa Dry Bypass, Right (west) Bank

Napa, Napa County, California. USACE records 1,274 people living in the area this system is built to protect.

Non-Accredited Levee SystemUSACE oversight
People behind it
1,274
USACE figure
Structures
172
in the leveed area
Levee length
n/a
miles, plus 0.24 of floodwall
Leveed area
0.11
square miles
01

The federal record

System ID
5305000070
System type
Levee System
FEMA accreditation
Non-Accredited Levee System
Screening rating (LSAC)
Low
Inspection rating
M
Inspection date
08/20/2019
Rehabilitation programme
Active
Responsible sponsor
The Napa County Flood Control and Water Conservation District
Waterway
Not published
Segments
1
USACE district
San Francisco
USACE division
South Pacific Division
FEMA region
9
Congressional district
04
Consequence estimate
$421.2 million
Flood of record
Not published

What this page does not tell you

It does not say whether any particular address is protected. A FEMA accreditation status describes this system measured against a design flood event, and USACE states that the database may not represent the totality of levees in the United States. If you need to know what applies to a specific property, your local floodplain administrator holds that answer. How to read an accreditation status.

02

Where it is

California
All levee systems in this state
Napa County, CA
All levee systems in this county

Source: USACE National Levee Database, system 5305000070. Refreshed 2026-09-10. Values are reproduced as published. USACE updates the database irregularly and without a change feed, so the refresh date above is the age of what you are reading.