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)

Sort:

CORP RR

Over: INTERSTATE 5

02-SIS-005-R66.97, Siskiyou, CA

Built 1971 ADT: 15,300

REAM AVE

Over: INTERSTATE 5

02-SIS-005-R9.65-MSHA, Siskiyou, CA

Built 1964 ADT: 20,000

LAKE ST

Over: INTERSTATE 5

02-SIS-005-R10.48-MSHA, Siskiyou, CA

Built 1964 ADT: 20,600

UP RR & AMTRAK

Over: INTERSTATE 5

02-SIS-005-R12.02, Siskiyou, CA

Built 1963 ADT: 20,000

LASSEN LANE

Over: INTERSTATE 5

02-SIS-005-R11.17-MSHA, Siskiyou, CA

Built 1964 ADT: 20,000

S5-N MT SHASTA OFF

Over: INTERSTATE 5

02-SIS-005-R12.06, Siskiyou, CA

Built 1964 ADT: 20,600

SISKIYOU AVE

Over: INTERSTATE 5

02-SIS-005-2.92-DMR, Siskiyou, CA

Built 1966 ADT: 2,000

AZALEA ROAD

Over: INTERSTATE 5

02-SIS-005-R8.29, Siskiyou, CA

Built 1964 ADT: 20,700

S5-S89 & N89-S5 CN

Over: INTERSTATE 5

02-SIS-089-R34.60, Siskiyou, CA

Built 1964 ADT: 19,300

S MT SHASTA-S5 ON

Over: INTERSTATE 5

02-SIS-005-R8.79, Siskiyou, CA

Built 1964 ADT: 19,300

I 5 SB

Over: E96-N5 CON,KLAMATH RIVER

02-SIS-005-R58.18L, Siskiyou, CA

Built 1969 ADT: 255

I 5 NB

Over: E96-N5 CON,KLAMATH RIVER

02-SIS-005-R58.18R, Siskiyou, CA

Built 1969 ADT: 255

INTERSTATE 5

Over: STEWART SPRINGS ROAD

02-SIS-005-R23.00, Siskiyou, CA

Built 1969 ADT: 100

INTERSTATE 5

Over: STEWART SPRINGS ROAD

02-SIS-005-R23.00, Siskiyou, CA

Built 1969 ADT: 100

LOUIE ROAD

Over: INTERSTATE 5

02-SIS-005-R31.18, Siskiyou, CA

Built 1969 ADT: 14,800

INTERSTATE 5 SB

Over: OBERLIN ROAD

02-SIS-005-R46.49-YRE, Siskiyou, CA

Built 1970 ADT: 4,000

INTERSTATE 5 NB

Over: OBERLIN ROAD

02-SIS-005-R46.49-YRE, Siskiyou, CA

Built 1970 ADT: 4,000

99-97 CUTOFF

Over: INTERSTATE 5

02-SIS-005-R38.21, Siskiyou, CA

Built 1969 ADT: 15,700

WALTERS ROAD

Over: INTERSTATE 5

02-SIS-005-R44.31, Siskiyou, CA

Built 1970 ADT: 17,100

INTERSTATE 5 SB

Over: STATE ROUTE 3

02-SIS-005-R48.23-YRE, Siskiyou, CA

Built 1970 ADT: 3,450

INTERSTATE 5 NB

Over: STATE ROUTE 3

02-SIS-005-R48.23-YRE, Siskiyou, CA

Built 1970 ADT: 3,450

ABRAMS LAKE ROAD

Over: INTERSTATE 5 SB

02-SIS-005-R13.18L, Siskiyou, CA

Built 1973 ADT: 24,600

ABRAMS LAKE ROAD

Over: INTERSTATE 5 NB

02-SIS-005-R13.18R, Siskiyou, CA

Built 1973 ADT: 22,500

INTERSTATE 5

Over: KILLGORE HILLS ROAD

02-SIS-005-R42.51, Siskiyou, CA

Built 1970 ADT: 2,530

INTERSTATE 5

Over: KILLGORE HILLS ROAD

02-SIS-005-R42.51, Siskiyou, CA

Built 1970 ADT: 2,530

SLOUGH ROAD

Over: INTERSTATE 5

02-SIS-005-R34.96, Siskiyou, CA

Built 1969 ADT: 15,700

INTERSTATE 5 SB

Over: MINER STREET

02-SIS-005-R47.56-YRE, Siskiyou, CA

Built 1970 ADT: 2,640

ROUTE 5

Over: MINER STREET

02-SIS-005-R47.56-YRE, Siskiyou, CA

Built 1970 ADT: 2,640

INTERSTATE 5 SB

Over: STATE ROUTE 265

02-SIS-005-R19.85-WEED, Siskiyou, CA

Built 1973 ADT: 2,000

INTERSTATE 5 NB

Over: STATE ROUTE 265

02-SIS-005-R19.85-WEED, Siskiyou, CA

Built 1973 ADT: 1,800

INTERSTATE 5 SB

Over: STATE ROUTE 97

02-SIS-005-R19.05-WEED, Siskiyou, CA

Built 1973 ADT: 12,100

INTERSTATE 5 NB

Over: STATE ROUTE 97

02-SIS-005-R19.05-WEED, Siskiyou, CA

Built 1973 ADT: 12,100

DITCH CREEK ROAD

Over: INTERSTATE 5

02-SIS-005-R62.92, Siskiyou, CA

Built 1974 ADT: 15,300

BAILEY HILL ROAD

Over: INTERSTATE 5

02-SIS-005-R65.52R, Siskiyou, CA

Built 1974 ADT: 15,300

INTERSTATE 5 SB

Over: HENLEY WAY

02-SIS-005-R61.55, Siskiyou, CA

Built 1974 ADT: 1,000

INTERSTATE 5 NB

Over: HENLEY WAY

02-SIS-005-R61.55, Siskiyou, CA

Built 1974 ADT: 1,020

HILT ROAD

Over: INTERSTATE 5

02-SIS-005-R68.33, Siskiyou, CA

Built 2017 ADT: 15,100

HORSE CREEK ROAD

Over: HORSE CREEK

HORSE, Siskiyou, CA

Built 1959 ADT: 50

SEIAD CREEK ROAD

Over: SEIAD CREEK

HORSE, Siskiyou, CA

Built 1959 ADT: 50

NO DATA ENTERED

Over: BEAR CREEK

BEAVER, Siskiyou, CA

Built 1990 ADT: 5

NO DATA ENTERED

Over: BEAR CREEK

BEAVER, Siskiyou, CA

Built 1969 ADT: 5

SOUTH INDIAN ROAD

Over: S. FORK INDIAN CREEK

INDIAN, Siskiyou, CA

Built 1966 ADT: 50

BENJAMIN CREEK RD

Over: DOOLITTLE CREEK

CLEAR CREEK, Siskiyou, CA

Built 1975 ADT: 50

ELK CREEK ROAD

Over: ELK CREEK

ELK-THOMPSON, Siskiyou, CA

Built 1949 ADT: 50

NO DATA ENTERED

Over: DOOLITTLE CREEK

ELK-THOMPSON, Siskiyou, CA

Built 1972 ADT: 10

NO DATA ENTERED

Over: TAYLOR CREEK

CECILVILLE, Siskiyou, CA

Built 1967 ADT: 10

NO DATA ENTERED

Over: WEST FK SHADOW CREEK

CECILVILLE, Siskiyou, CA

Built 1991 ADT: 5

NO DATA ENTERED

Over: TAYLOR CREEK

CECILVILLE, Siskiyou, CA

Built 1965 ADT: 30

CHINA MT. ROAD

Over: CRATER CREEK

CALLAHAN, Siskiyou, CA

Built 1974 ADT: 50

TWO POINTS ROAD

Over: SINGLETON CREEK

SCOTT BAR, Siskiyou, CA

Built 1996 ADT: 50

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

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Compiled by PlainBridges, Independent data publisher

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.