Siskiyou County, CA

423 public highway bridges

Siskiyou County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Siskiyou County, California contains 423 public highway bridges. Roughly 36.2% are rated “Good,” 49.6% “Fair,” and 5.4% “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.

423
Total Bridges
36.2%
Good
49.6%
Fair
5.4%
Poor Condition

Condition Distribution

Good
36.2% (153)
Fair
49.6% (210)
Poor
5.4% (23)

All Bridges (423)

OLD COTTONWOOD CR

Poor

Over: COTTONWOOD CREEK

0.2 MI E/O COTTONWOOD CK, Siskiyou, CA

Built 1957 ADT: 10

WEST BEAVER ROAD

Poor

Over: WEST FORK BEAVER CREEK

BEAVER, Siskiyou, CA

Built 1983 ADT: 50

TRAPPER ROAD

Poor

Over: TRAPPER CREEK

BEAVER, Siskiyou, CA

Built 1978 ADT: 50

METHODIST CK ROAD

Poor

Over: S. FK. SALMON RIVER

FORKS, Siskiyou, CA

Built 1963 ADT: 20

CHINA MT. ROAD

Poor

Over: HOUSTON CREEK

CALLAHAN, Siskiyou, CA

Built 1974 ADT: 50

BOULDER ROAD

Poor

Over: EAST BOULDER CREEK

CALLAHAN, Siskiyou, CA

Built 1966 ADT: 50

TOM WALKER ROAD

Poor

Over: TOMPKINS CREEK

SCOTT BAR, Siskiyou, CA

Built 1988 ADT: 50

NO DATA ENTERED

Poor

Over: WEST BOULDER CREEK

CALLAHAN, Siskiyou, CA

Built 2004 ADT: 50

HORSE CREEK RD

Poor

Over: KLAMATH RIVER

0.04 MI NORTH OF SR 96, Siskiyou, CA

Built 1930 Load: 7.5 t ADT: 21

CAMP EDEN ROAD

Poor

Over: DUCK LAKE CREEK

CALLAHAN, Siskiyou, CA

Built 1949 Load: 11.0 t ADT: 50

SCOTT MTN RD

Poor

Over: EAST FORK SCOTT RIVER

AT GAZELLE CALLAHAN RD, Siskiyou, CA

Built 1914 Load: 12.3 t ADT: 23

YORK ROAD

Poor

Over: WILLOW CREEK

0.2 MI E OF AIRPORT RD, Siskiyou, CA

Built 1930 Load: 13.9 t ADT: 39

LAKE VIEW ROAD

Poor

Over: KLAMATH RIVER

SOUTH OF COPCO ROAD, Siskiyou, CA

Built 1960 Load: 14.9 t ADT: 226

HOSPITAL ROAD

Poor

Over: YREKA CREEK

BEHIND COUNTY HOSPITAL, Siskiyou, CA

Built 1987 Load: 15.2 t ADT: 200

HARRY CASH ROAD

Poor

Over: LITTLE SHASTA RIVER

0.25 MI S OF BALL MTN RD, Siskiyou, CA

Built 1920 Load: 15.6 t ADT: 353

ROAD

Poor

Over: MID FK APPLEGATE

NO DATA ENTERED, Siskiyou, CA

Built 1963 Load: 24.5 t ADT: 10

ROAD

Poor

Over: BUTTE FORK CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1951 Load: 27.2 t ADT: 10

STATE ROUTE 96

Poor

Over: THOMPSON CREEK

02-SIS-096-52.48, Siskiyou, CA

Built 1952 Load: 32.4 t ADT: 615

BARKHOUSE CREEK RD

Poor

Over: BARKHOUSE CREEK

0.7 MI S OF WALKER RD, Siskiyou, CA

Built 1998 Load: 32.4 t ADT: 29

STATE ROUTE 96

Poor

Over: SCOTT RIVER

02-SIS-096-71.23, Siskiyou, CA

Built 1957 Load: 32.7 t ADT: 600

N OLD STAGE RD

Poor

Over: SHASTA RIVER

0.8 MI N COLLEGE AVE, Siskiyou, CA

Built 1968 Load: 34.0 t ADT: 379

SALMON RIVER ROAD

Poor

Over: SALMON RIVER

13.2 MI W/O SAWYERS BAR R, Siskiyou, CA

Built 1966 Load: 40.2 t ADT: 210

INDEPENDENCE ROAD

Poor

Over: INDEPENDENCE CREEK

CLEAR CREEK, Siskiyou, CA

Built 1970 Load: 90.8 t ADT: 20

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

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.