Sierra County, CA
65 public highway bridges
Sierra County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Sierra County, California contains 65 public highway bridges. Roughly 40% are rated “Good,” 52.3% “Fair,” and 7.7% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.
Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.
Source: FHWA National Bridge Inventory. See methodology for full definitions.
Condition Distribution
All Bridges (65)
STATE ROUTE 49
GoodOver: SMITHNECK CREEK
03-SIE-049-60.54-LOY, Sierra, CA
STATE ROUTE 49
GoodOver: HILLSIDE
03-SIE-049-7.47, Sierra, CA
STATE ROUTE 49
GoodOver: GOODYEARS CREEK
03-SIE-049-R12.24, Sierra, CA
U.S. HIGHWAY 395
GoodOver: LONG VALLEY RD
03-SIE-395-R2.23L, Sierra, CA
U.S. HIGHWAY 395
GoodOver: LONG VALLEY RD
03-SIE-395-R2.19R, Sierra, CA
ROAD 7-30
GoodOver: LITTLE TRUCKEE RIVER
S27 T19N R14E, Sierra, CA
STATE ROUTE 49
GoodOver: HILLSIDE
03-SIE-049-15.69, Sierra, CA
ROAD 21N02
GoodOver: SULPHUR CREEK
SULPHUR CREEK, Sierra, CA
MOUNTAIN HOUSE RD
GoodOver: SOUTH FORK OREGON CREEK
9.94 MI SOUTH OF RTE 49, Sierra, CA
STATE ROUTE 49
GoodOver: HILLSIDE
03-SIE-049-2.51, Sierra, CA
PACKER LAKE ROAD
PoorOver: SALMON CREEK
WEST OF GOLD LAKES ROAD, Sierra, CA
STATE ROUTE 49
PoorOver: SALMON CREEK
03-SIE-049-R32.90, Sierra, CA
WESTSIDE RD
PoorOver: SOUTH BRANCH CARMAN CRK
NORTH OF CALPINE AREA, Sierra, CA
WESTSIDE RD
PoorOver: NORTH BRANCH CARMAN CRK
6.1 MI N SR 89 & 49, Sierra, CA
RAILROAD AVENUE
PoorOver: EAST BRANCH SMITHNECK CR
1/4 MI SOUTH OF ROUTE 49, Sierra, CA
Read our methodology - how this data is sourced, computed, and verified.
Related
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.