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)

STATE ROUTE 96

Fair

Over: TI CREEK

02-SIS-096-R11.99, Siskiyou, CA

Built 1967 Load: 23.3 t ADT: 330

STATE ROUTE 3

Fair

Over: SHASTA RIVER

02-SIS-003-51.76, Siskiyou, CA

Built 1959 Load: 23.3 t ADT: 2,900

STATE ROUTE 96

Fair

Over: CLEAR CREEK

02-SIS-096-32.60, Siskiyou, CA

Built 1966 Load: 23.3 t ADT: 400

SCARLETT WAY

Fair

Over: SACRAMENTO RIVER

0.2 MI NW DUNSMUIR AVE, Siskiyou, CA

Built 1970 Load: 23.3 t ADT: 59

ROAD

Fair

Over: JOE CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1954 Load: 23.6 t ADT: 10

DUNSMUIR AVENUE

Fair

Over: SACRAMENTO,UP RR,AMTRAK

02-SIS-005-2.65-DMR, Siskiyou, CA

Built 1966 Load: 24.3 t ADT: 5,000

STATE ROUTE 263

Fair

Over: SHASTA RIVER

02-SIS-263-55.03, Siskiyou, CA

Built 1931 Load: 24.3 t ADT: 1,200

STATE ROUTE 96

Fair

Over: STANSHAW CREEK

02-SIS-096-R8.20, Siskiyou, CA

Built 1942 Load: 24.3 t ADT: 330

STATE ROUTE 96

Fair

Over: LUMGREY CREEK

02-SIS-096-93.07, Siskiyou, CA

Built 1923 Load: 24.3 t ADT: 650

STATE ROUTE 96

Fair

Over: EMPIRE CREEK

02-SIS-096-93.09, Siskiyou, CA

Built 1923 Load: 24.3 t ADT: 800

COPCO RD

Fair

Over: FALL CREEK

0.3 MI W FALL CREEK RD, Siskiyou, CA

Built 1969 Load: 24.3 t ADT: 42

CRAM GULCH RD

Fair

Over: SCHULMEYER GULCH

OLD HWY 99, Siskiyou, CA

Built 1972 Load: 24.3 t ADT: 391

WEST ST

Fair

Over: HUMBUG GULCH

0.05 MI S/O MINER ST, Siskiyou, CA

Built 1965 Load: 24.3 t ADT: 165

CHINA GRADE ROAD

Fair

Over: CHINA CREEK

1.9 MI N. EAST HORSE CR., Siskiyou, CA

Built 1956 Load: 24.3 t ADT: 50

ROAD

Fair

Over: MID FK APPLEGATE

NO DATA ENTERED, Siskiyou, CA

Built 1951 Load: 24.5 t ADT: 50

AGER ROAD

Fair

Over: OREGON SLOUGH

0.45 MI S RESERVOIR RD, Siskiyou, CA

Built 1980 Load: 24.6 t ADT: 841

CARIBOU RD

Fair

Over: SOUTH FORK SALMON RIVER

4 MI S CECILVILLE RD, Siskiyou, CA

Built 1965 Load: 24.6 t ADT: 100

NO DATA ENTERED

Fair

Over: ELK CREEK

ELK-THOMPSON, Siskiyou, CA

Built 1971 Load: 24.9 t ADT: 30

SALMON RIVER RD

Fair

Over: BUTLER CREEK

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

Built 1938 Load: 25.3 t ADT: 101

ROAD

Fair

Over: ELLIOTT CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1953 Load: 25.4 t ADT: 12

ROAD

Fair

Over: ELLIOTT CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1954 Load: 25.4 t ADT: 10

ELLER LANE

Fair

Over: PATTERSON CREEK

0.2 MI W ISLAND RD, Siskiyou, CA

Built 1971 Load: 25.6 t ADT: 71

STATE ROUTE 3

Fair

Over: PATTERSON CREEK

02-SIS-003-24.26, Siskiyou, CA

Built 1962 Load: 25.9 t ADT: 2,825

STATE ROUTE 96

Fair

Over: INDIAN CREEK

02-SIS-096-41.02, Siskiyou, CA

Built 1962 Load: 25.9 t ADT: 1,000

SAWYERS BAR RD

Fair

Over: JACKASS GULCH

1.7 MI W EDDYS GULCH RD, Siskiyou, CA

Built 1968 Load: 25.9 t ADT: 323

FAIRLANE ROAD

Fair

Over: YREKA CREEK

0.3 MI S/O SHARPS RD, Siskiyou, CA

Built 1970 Load: 26.9 t ADT: 1,081

HILT HUNGRY ROAD

Fair

Over: COTTONWOOD CREEK

1.4 MI SOUTH OF HILT RD, Siskiyou, CA

Built 1933 Load: 27.2 t ADT: 23

SANDY BAR ROAD

Fair

Over: TI CREEK

UKONOM, Siskiyou, CA

Built 1965 Load: 27.2 t ADT: 50

SHACKLEFORD CK RD

Fair

Over: BIG MEADOWS CREEK

SCOTT BAR, Siskiyou, CA

Built 1982 Load: 27.9 t ADT: 50

STATE ROUTE 263

Fair

Over: SHASTA RIVER

02-SIS-263-56.35, Siskiyou, CA

Built 1931 Load: 28.2 t ADT: 1,200

MULLOY ROAD

Fair

Over: WILLOW CREEK

0.5 MI SOUTH OF YORK RD, Siskiyou, CA

Built 1982 Load: 28.2 t ADT: 41

SCOTT RIVER RD

Fair

Over: MIDDLE CREEK

1.4 MI N KELSEY CREEK RD, Siskiyou, CA

Built 1900 Load: 28.5 t ADT: 135

STATE ROUTE 263

Fair

Over: DRY GULCH

02-SIS-263-54.51, Siskiyou, CA

Built 1929 Load: 28.8 t ADT: 1,200

INTERSTATE 5 SB

Fair

Over: SHASTA RIVER

02-SIS-005-R51.16, Siskiyou, CA

Built 1970 Load: 28.8 t ADT: 7,050

STATE ROUTE 96

Fair

Over: OAK FLAT CREEK

02-SIS-096-34.35, Siskiyou, CA

Built 1952 Load: 29.2 t ADT: 400

INTERSTATE 5 NB

Fair

Over: SHASTA RIVER

02-SIS-005-R51.16, Siskiyou, CA

Built 1970 Load: 29.2 t ADT: 7,050

CECILVILLE ROAD

Fair

Over: BLACK BEAR CREEK

10.1 MI N/W CECILVILLE, Siskiyou, CA

Built 1940 Load: 29.2 t ADT: 101

INTERSTATE 5

Fair

Over: MOONLIT OAKS AVE

02-SIS-005-R45.62-YRE, Siskiyou, CA

Built 1970 Load: 29.5 t ADT: 8,300

INTERSTATE 5

Fair

Over: MOONLIT OAKS AVE

02-SIS-005-R45.62-YRE, Siskiyou, CA

Built 1970 Load: 29.5 t ADT: 8,300

INTERSTATE 5

Fair

Over: DEETZ ROAD

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

Built 1973 Load: 29.5 t ADT: 12,300

INTERSTATE 5 SB

Fair

Over: TRUITMAN LANE

02-SIS-005-R36.02, Siskiyou, CA

Built 1969 Load: 29.8 t ADT: 7,550

INTERSTATE 5 NB

Fair

Over: TRUITMAN LANE

02-SIS-005-R36.02, Siskiyou, CA

Built 1969 Load: 29.8 t ADT: 7,550

INTERSTATE 5 NB

Fair

Over: SOUTH WEED BLVD

02-SIS-005-R17.44, Siskiyou, CA

Built 1973 Load: 30.1 t ADT: 7,150

INTERSTATE 5 SB

Fair

Over: SOUTH WEED BLVD

02-SIS-005-R17.44, Siskiyou, CA

Built 1973 Load: 30.5 t ADT: 7,150

INTERSTATE 5

Fair

Over: MOTT ROAD

02-SIS-005-5.90, Siskiyou, CA

Built 1976 Load: 30.5 t ADT: 20,000

CECILVILLE ROAD

Fair

Over: INDIAN CREEK

10.7 MI N/O EDDY GULCH RD, Siskiyou, CA

Built 1940 Load: 30.5 t ADT: 100

INTERSTATE 5 SB

Fair

Over: UP RR & AMTRAK

02-SIS-005-R9.20, Siskiyou, CA

Built 1964 Load: 30.8 t ADT: 20,000

EDDYS GULCH ROAD

Fair

Over: NORTH FORK SALMON RIVER

S SAWYERS BAR RD, Siskiyou, CA

Built 1968 Load: 30.8 t ADT: 167

E LENNOX ST

Fair

Over: YREKA CREEK

0.1 MI E/O SR 3, Siskiyou, CA

Built 1953 Load: 31.8 t ADT: 4

INTERSTATE 5

Fair

Over: GREENHORN CREEK

02-SIS-005-R46.05-YRE, Siskiyou, CA

Built 1970 Load: 32.4 t ADT: 16,600

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.