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)

U.S. HIGHWAY 97

Fair

Over: SHEEP ROCK CATTLEPASS

02-SIS-097-R14.65, Siskiyou, CA

Built 1976 Load: 32.4 t ADT: 3,250

STATE ROUTE 3

Fair

Over: KIDDER CREEK

02-SIS-003-27.09, Siskiyou, CA

Built 1956 Load: 32.4 t ADT: 2,825

STATE ROUTE 3

Fair

Over: KIDDER CREEK

02-SIS-003-31.23, Siskiyou, CA

Built 1956 Load: 32.4 t ADT: 2,825

STATE ROUTE 161

Fair

Over: OREGON DRAIN

02-SIS-161-3.48, Siskiyou, CA

Built 1946 Load: 32.4 t ADT: 655

U.S. HIGHWAY 97

Fair

Over: CORP RR

02-SIS-097-0.15-WEED, Siskiyou, CA

Built 1982 Load: 32.4 t ADT: 18,000

U.S. HIGHWAY 97

Fair

Over: WHITNEY CREEK

02-SIS-097-9.61, Siskiyou, CA

Built 1982 Load: 32.4 t ADT: 5,000

STATE ROUTE 96

Fair

Over: KOHL CREEK

02-SIS-096-80.05, Siskiyou, CA

Built 1953 Load: 32.4 t ADT: 650

INTERSTATE 5

Fair

Over: YREKA CREEK

02-SIS-005-R45.61-YRE, Siskiyou, CA

Built 1970 Load: 32.4 t ADT: 16,600

STATE ROUTE 3

Fair

Over: ETNA CREEK

02-SIS-003-20.44, Siskiyou, CA

Built 1959 Load: 32.4 t ADT: 880

I-5 OFFRMP/KLAMATH

Fair

Over: WILLIAMS CREEK

02-SIS-005-R58.10L, Siskiyou, CA

Built 1969 Load: 32.4 t ADT: 60

HIGHWAY 96

Fair

Over: O'NEIL CREEK

02-SIS-096-65.38, Siskiyou, CA

Built 2008 Load: 32.4 t ADT: 600

STATE ROUTE 161

Fair

Over: LOST RIVER

02-SIS-161-19.18, Siskiyou, CA

Built 2008 Load: 32.4 t ADT: 655

GAZELLE-CALLAHAN R

Fair

Over: SOUTH FORK WILLOW CREEK

4.6 MI W OLD HY 99, Siskiyou, CA

Built 1973 Load: 32.4 t ADT: 306

HENLEY-HORNBROK RD

Fair

Over: COTTONWOOD CREEK

0.10 MI E HORNBROOK RD, Siskiyou, CA

Built 1989 Load: 32.4 t ADT: 377

ISLAND ROAD

Fair

Over: SCOTT RIVER OVERFLOW

0.75 MI W OF E ROAD, Siskiyou, CA

Built 1989 Load: 32.4 t ADT: 35

WALKER ROAD CONN

Fair

Over: KLAMATH RIVER

0.025 KM S SR 96, Siskiyou, CA

Built 1997 Load: 32.4 t ADT: 125

ISLAND RD

Fair

Over: SCOTT RIVER OVERFLOW

0.3 MI E SERPA LANE, Siskiyou, CA

Built 1986 Load: 32.4 t ADT: 170

AGER BESWICK ROAD

Fair

Over: BOGUS CREEK

7.6 MI EAST OF AGER ROAD, Siskiyou, CA

Built 2002 Load: 32.4 t ADT: 100

HORSE CREEK ROAD

Fair

Over: MIDDLE CREEK

2.5 MI N OF SR 96, Siskiyou, CA

Built 1971 Load: 32.4 t ADT: 21

SCOTT RIVER RD

Fair

Over: MCGUFFY CREEK

2.7 MI S MILL CRK RD, Siskiyou, CA

Built 1979 Load: 32.4 t ADT: 39

MOFFETT CREEK RD

Fair

Over: MOFFETT CREEK

2.6 MI EAST SR 3, Siskiyou, CA

Built 1989 Load: 32.4 t ADT: 145

OLD HWY 99

Fair

Over: WILLOW CREEK

1.0 MI S GAZELLE-CALLAHAN, Siskiyou, CA

Built 1994 Load: 32.4 t ADT: 1,005

DUZEL CREEK RD

Fair

Over: DUZEL CREEK

0.2 MI SW SCARFACE RD, Siskiyou, CA

Built 1974 Load: 32.4 t ADT: 15

KLAMATH RIVER ROAD

Fair

Over: VESA CREEK

7 MI NW HUMBUG CR RD, Siskiyou, CA

Built 1974 Load: 32.4 t ADT: 23

COPCO ROAD

Fair

Over: JENNY CREEK

COPCO ROAD, Siskiyou, CA

Built 2008 Load: 32.4 t ADT: 50

STATE ROUTE 96

Fair

Over: KLAMATH RIVER

02-SIS-096-61.14, Siskiyou, CA

Built 1954 Load: 32.7 t ADT: 600

STATE ROUTE 3

Fair

Over: FRENCH CREEK

02-SIS-003-16.87, Siskiyou, CA

Built 1959 Load: 32.7 t ADT: 880

SECOND AVENUE

Fair

Over: INDIAN CREEK

AT INDIAN CREEK RD, Siskiyou, CA

Built 1966 Load: 32.7 t ADT: 1,936

PATROL RD UNIT 3A

Fair

Over: CANAL TURNOUT

CENTER PATROL RD/UNIT 3A, Siskiyou, CA

Built 1953 Load: 32.7 t

AUTO TOUR ROAD

Fair

Over: CANAL TURNOUT

SW CORNER UNIT 4A, Siskiyou, CA

Built 1963 Load: 32.7 t ADT: 50

SAWYERS BAR RD

Fair

Over: LITTLE N FK SALMON RIVER

1 MI W KELLEY GULCH RD, Siskiyou, CA

Built 1968 Load: 33.0 t ADT: 120

STATE ROUTE 263

Fair

Over: SHASTA RIVER

02-SIS-263-52.62, Siskiyou, CA

Built 1928 Load: 33.4 t ADT: 1,200

INTERSTATE 5

Fair

Over: PARKS CREEK

02-SIS-005-R27.18, Siskiyou, CA

Built 1969 Load: 33.4 t ADT: 7,400

W. A. BARR RD

Fair

Over: SACRAMENTO RIVER

1.5 MI S OF W REAM AVE, Siskiyou, CA

Built 1968 Load: 34.0 t ADT: 864

BUKER ROAD

Fair

Over: KELSEY CREEK

SCOTT BAR, Siskiyou, CA

Built 1984 Load: 34.3 t ADT: 15

SALMON RIVER ROAD

Fair

Over: NORDHEIMER CREEK

4 MI N/O SAWYERS BAR RD, Siskiyou, CA

Built 1967 Load: 34.7 t ADT: 93

SCOTT RIVER ROAD

Fair

Over: SCOTT RIVER

1.2 MI SOUTH OF SR 96, Siskiyou, CA

Built 1967 Load: 35.0 t ADT: 186

BOULDER CREEK RD

Fair

Over: BOULDER CREEK

0.4 MI E CANYON CRK RD, Siskiyou, CA

Built 1993 Load: 35.3 t ADT: 8

INTERSTATE 5

Fair

Over: DEETZ ROAD

02-SIS-005-R15.32, Siskiyou, CA

Built 1973 Load: 36.0 t ADT: 12,300

INTERSTATE 5

Fair

Over: PANORAMA ROAD

02-SIS-005-1.21, Siskiyou, CA

Built 1960 Load: 36.3 t ADT: 18,000

QUARTZ VALLEY ROAD

Fair

Over: MILL CREEK

0.1 MI W E. QUARTZ VALLEY, Siskiyou, CA

Built 1980 Load: 36.6 t ADT: 395

STATE ROUTE 96

Fair

Over: KLAMATH RIVER

02-SIS-096-77.15, Siskiyou, CA

Built 1953 Load: 36.9 t ADT: 650

INTERSTATE 5

Fair

Over: PARKS CREEK

02-SIS-005-R27.18, Siskiyou, CA

Built 1969 Load: 36.9 t ADT: 7,400

WYEHKA WAY

Fair

Over: WAGON CREEK

0.1 MI W OLD STAGE RD, Siskiyou, CA

Built 1968 Load: 36.9 t ADT: 143

INTERSTATE 5

Fair

Over: DUNSMUIR AVE

02-SIS-005-0.69, Siskiyou, CA

Built 1960 Load: 37.3 t ADT: 18,000

INTERSTATE 5

Fair

Over: DUNSMUIR AVE

02-SIS-005-2.51-DMR, Siskiyou, CA

Built 1960 Load: 37.3 t ADT: 18,000

STATE ROUTE 3

Fair

Over: EAST FORK SCOTT RIVER

02-SIS-003-8.66, Siskiyou, CA

Built 1968 Load: 37.3 t ADT: 190

SAWYERS BAR RD

Fair

Over: NORTH RUSSIAN CREEK

4.7 MI N WHITES GULCH RD, Siskiyou, CA

Built 1968 Load: 37.3 t ADT: 105

ELK CREEK ROAD

Fair

Over: KLAMATH RIVER

0.3 MI S OF SH 96, Siskiyou, CA

Built 1953 Load: 37.3 t ADT: 1,392

INTERSTATE 5

Fair

Over: CRAM GULCH

02-SIS-005-R39.02, Siskiyou, CA

Built 1969 Load: 37.6 t ADT: 7,850

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

Related

Browse all → | Rankings →
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.