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)

WHITES GULCH ROAD

Good

Over: WHITES GULCH

0.4 M S OF SAWYER BAR RD, Siskiyou, CA

Built 2009 Load: 32.4 t ADT: 25

EDGEWOOD ROAD

Good

Over: SHASTA RIVER

0.3 M SO STEWART SPRINGS, Siskiyou, CA

Built 2009 Load: 32.4 t ADT: 100

SAWYERS BAR ROAD

Good

Over: KELLY GULCH

3.2 M W OF EDDY GULCH RD., Siskiyou, CA

Built 2006 Load: 32.4 t ADT: 150

CHINA GRADE ROAD

Good

Over: HORSE CREEK

6.7 MI NE ELK CK ROAD, Siskiyou, CA

Built 2008 Load: 32.4 t ADT: 50

MINERS CREEK ROAD

Good

Over: FRENCH CREEK

0.1 MI E FRENCH CREEK RD, Siskiyou, CA

Built 1967 Load: 32.7 t ADT: 62

ROAD

Good

Over: ELLIOTT CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1969 Load: 32.7 t ADT: 15

SCOTT RIVER ROAD

Good

Over: MOFFETT CREEK

0.3 MI N STATE ROUTE 3, Siskiyou, CA

Built 1962 Load: 33.7 t ADT: 1,032

WHITES GULCH ROAD

Good

Over: NORTH FORK SALMON RIVER

S OF SAWYERS BAR RD, Siskiyou, CA

Built 1969 Load: 33.7 t ADT: 50

ELK CREEK ROAD

Good

Over: ELK CREEK

5.1 MI S OF SR96, Siskiyou, CA

Built 1967 Load: 34.3 t ADT: 293

OBERLIN RD (YREKA)

Good

Over: YREKA CREEK

0.1 MI E/O FAIRLANE RD, Siskiyou, CA

Built 1959 Load: 35.0 t ADT: 1,839

PETERSBURG RD

Good

Over: SOUTH FORK SALMON RIVER

0.1 MI S CALHN-CECILVL RD, Siskiyou, CA

Built 1969 Load: 35.0 t ADT: 29

YREKA AGER RD

Good

Over: SHASTA RIVER

1.25 MI NE OF SR 3, Siskiyou, CA

Built 1969 Load: 35.6 t ADT: 536

INDIAN CREEK ROAD

Good

Over: EAST FORK INDIAN CREEK

7.6 MI N OF SR 96, Siskiyou, CA

Built 1967 Load: 36.9 t ADT: 142

MINERS CREEK ROAD

Good

Over: MINERS CREEK

1.8 MI S FRENCH CREEK RD, Siskiyou, CA

Built 1968 Load: 36.9 t ADT: 62

DENNIS LANE

Good

Over: WILLOW CREEK

0.5 MI E OF AGER RD, Siskiyou, CA

Built 1969 Load: 37.3 t ADT: 20

WALKER ROAD

Good

Over: BARKHOUSE CREEK

1.05 MI E WALKER BR CONN, Siskiyou, CA

Built 1969 Load: 37.9 t ADT: 68

PONDOSA WAY

Good

Over: BEAR CREEK

0.8 MI N SR 89, Siskiyou, CA

Built 1977 Load: 37.9 t ADT: 39

CARIBOU ROAD

Good

Over: E FK OF S FK SALMON RIV

0.2 MI S CECILVILLE RD, Siskiyou, CA

Built 1965 Load: 38.2 t ADT: 100

QUARTZ VALLEY ROAD

Good

Over: SHACKLEFORD CREEK

AT DANGLE LANE, Siskiyou, CA

Built 2005 Load: 38.2 t ADT: 400

INTERSTATE 5

Good

Over: OAK STREET

02-SIS-005-1.79, Siskiyou, CA

Built 1960 Load: 39.9 t ADT: 18,000

INTERSTATE 5

Good

Over: GUYS GULCH

02-SIS-005-R39.27, Siskiyou, CA

Built 1969 Load: 39.9 t ADT: 8,300

INTERSTATE 5

Good

Over: WILLOW STREET

02-SIS-005-2.09-DMR, Siskiyou, CA

Built 1960 Load: 40.2 t ADT: 18,000

STATE ROUTE 96

Good

Over: LITTLE GRIDER CREEK

02-SIS-096-40.02, Siskiyou, CA

Built 1967 Load: 40.5 t ADT: 1,013

BAR ROAD

Good

Over: KLAMATH RIVER

AT SR 96, Siskiyou, CA

Built 1998 Load: 40.5 t ADT: 21

SALMON RIVER ROAD

Good

Over: MERRILL CREEK

SALMON RIVER ROAD, Siskiyou, CA

Built 2002 Load: 40.5 t ADT: 250

STATE ROUTE 96

Good

Over: BEAVER CREEK

02-SIS-096-88.26, Siskiyou, CA

Built 1932 Load: 41.5 t ADT: 650

INTERSTATE 5

Good

Over: JULIEN CREEK

02-SIS-005-R40.12, Siskiyou, CA

Built 1969 Load: 41.5 t ADT: 8,300

INTERSTATE 5

Good

Over: JULIEN CREEK

02-SIS-005-R40.12, Siskiyou, CA

Built 1969 Load: 41.5 t ADT: 8,300

GRIDER ROAD

Good

Over: WEST GRIDER CREEK

3 MI SW OF SR96, Siskiyou, CA

Built 1971 Load: 42.1 t ADT: 6

TENNANT RD

Good

Over: BUTTE CREEK

4.4 MI SE SR97, Siskiyou, CA

Built 1981 Load: 42.4 t ADT: 67

NO DATA ENTERED

Good

Over: WEST BRANCH INDIAN CK

INDIAN CREEK, Siskiyou, CA

Built 2010 Load: 42.8 t ADT: 32

DUZEL CREEK RD

Good

Over: MOFFETT CREEK

0.1 MI SW SCARFACE RD, Siskiyou, CA

Built 1971 Load: 43.1 t ADT: 15

RAIL CREEK ROAD

Good

Over: EAST FORK SCOTT RIVER

0.2 MI E CALLAHAN-GAZELLE, Siskiyou, CA

Built 1998 Load: 43.4 t ADT: 300

INDEPENDENCE ROAD

Good

Over: KLAMATH RIVER

CLEAR CREEK, Siskiyou, CA

Built 1966 Load: 43.7 t ADT: 50

INTERSTATE 5

Good

Over: DUNSMUIR AVE

02-SIS-005-3.84-DMR, Siskiyou, CA

Built 1976 Load: 44.1 t ADT: 19,200

INTERSTATE 5

Good

Over: SHASTA RIVER

02-SIS-005-R22.62, Siskiyou, CA

Built 1960 Load: 45.0 t ADT: 7,800

COPCO RD

Good

Over: BRUSH CREEK

5 MI E AGER RD, Siskiyou, CA

Built 1976 Load: 46.3 t ADT: 226

INTERSTATE 5

Good

Over: MOTT ROAD

02-SIS-005-5.90, Siskiyou, CA

Built 1976 Load: 46.7 t ADT: 20,000

INTERSTATE 5

Good

Over: SHASTA RIVER

02-SIS-005-R22.62, Siskiyou, CA

Built 1960 Load: 48.0 t ADT: 7,800

MASTERSON ROAD

Good

Over: EAST FORK SCOTT RIVER

2.4 MI W GAZELLE CALLAHAN, Siskiyou, CA

Built 1975 Load: 48.6 t ADT: 185

CECILVILLE ROAD

Good

Over: KNOWNOTHING CREEK

2 MI S/O SALMON RIVER RD, Siskiyou, CA

Built 1987 Load: 49.2 t ADT: 100

JOHNNY O'NEIL ROAD

Good

Over: HORSE CREEK

HORSE, Siskiyou, CA

Built 1975 Load: 49.6 t ADT: 30

NO DATA ENTERED

Good

Over: HORSE CREEK

HORSE, Siskiyou, CA

Built 1975 Load: 49.6 t ADT: 20

HORSE CR RD

Good

Over: BUCKHORN CREEK

1.2 MI N OF RTE 96, Siskiyou, CA

Built 1968 Load: 50.2 t ADT: 21

KLAMATH RIVER ROAD

Good

Over: HUMBUG CREEK

AT HUMBUG CREEK RD, Siskiyou, CA

Built 1975 Load: 66.4 t ADT: 20

STATE ROUTE 96

Good

Over: KLAMATH RIVER

02-SIS-096-R5.75, Siskiyou, CA

Built 1970 Load: 73.5 t ADT: 410

MASTERSONS ROAD

Good

Over: KANGAROO CREEK

1.5 MI W GAZELLE CALLAHAN, Siskiyou, CA

Built 1975 Load: 80.4 t ADT: 185

COPCO ROAD

Good

Over: COTTONWOOD CREEK

0.9 MI EAST OF I-5, Siskiyou, CA

Built 1980 Load: 85.5 t ADT: 390

SOUTH RUSSIAN ROAD

Good

Over: SOUTH RUSSIAN CREEK

SAWYERS BAR, Siskiyou, CA

Built 1968 Load: 90.8 t ADT: 20

STATE ROUTE 96

Good

Over: KLAMATH RIVER

02-SIS-096-R5.08, Siskiyou, CA

Built 1970 Load: 99.8 t ADT: 410

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.