Siskiyou County, CA

423 public highway bridges

Siskiyou County Bridge Snapshot

Siskiyou County, California contains 423 public highway bridges in the FHWA National Bridge Inventory. Roughly 36.2% are rated “Good,” 49.6% “Fair,” 5.4% “Poor,” and 5.4% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in CA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

423
Total Bridges
36.2%
Good
5.4%
Poor
5.4%
Structurally Deficient

Condition Distribution

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

All Bridges (423)

TRAPPER ROAD

Poor

Over: TRAPPER CREEK

BEAVER, Siskiyou, CA

Built 1978 ADT: 50

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

OLD COTTONWOOD CR

Structurally Deficient

Over: COTTONWOOD CREEK

0.2 MI E/O COTTONWOOD CK, Siskiyou, CA

Built 1957 ADT: 10

WEST BEAVER ROAD

Structurally Deficient

Over: WEST FORK BEAVER CREEK

BEAVER, Siskiyou, CA

Built 1983 ADT: 50

METHODIST CK ROAD

Structurally Deficient

Over: S. FK. SALMON RIVER

FORKS, Siskiyou, CA

Built 1963 ADT: 20

CHINA MT. ROAD

Structurally Deficient

Over: HOUSTON CREEK

CALLAHAN, Siskiyou, CA

Built 1974 ADT: 50

BOULDER ROAD

Structurally Deficient

Over: EAST BOULDER CREEK

CALLAHAN, Siskiyou, CA

Built 1966 ADT: 50

TOM WALKER ROAD

Structurally Deficient

Over: TOMPKINS CREEK

SCOTT BAR, Siskiyou, CA

Built 1988 ADT: 50

NO DATA ENTERED

Structurally Deficient

Over: WEST BOULDER CREEK

CALLAHAN, Siskiyou, CA

Built 2004 ADT: 50

HORSE CREEK RD

Structurally Deficient

Over: KLAMATH RIVER

0.04 MI NORTH OF SR 96, Siskiyou, CA

Built 1930 Load: 7.5 t ADT: 21

INDEPENDENCE ROAD

Structurally Deficient

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.

Related

Browse all → | Rankings →
Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial