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)

LONG JOHN ROAD

Good

Over: COW CREEK

BEAVER, Siskiyou, CA

Built 1958 ADT: 50

GRIDER CREEK ROAD

Good

Over: GRIDER CREEK

HORSE, Siskiyou, CA

Built 1966 ADT: 50

NO DATA ENTERED

Good

Over: NORTH HUNGRY CREEK

BEAVER 1, Siskiyou, CA

Built 2004 ADT: 50

CLEAR CREEK ROAD

Good

Over: WINGATE CREEK

CLEAR CREEK, Siskiyou, CA

Built 1951 ADT: 50

MILL CK RIDGE ROAD

Good

Over: MILL CREEK

INDIAN, Siskiyou, CA

Built 1967 ADT: 50

MILL CK RIDGE ROAD

Good

Over: TRIB TO MILL CREEK

INDIAN, Siskiyou, CA

Built 1967 ADT: 50

NO DATA ENTERED

Good

Over: THOMPSON CREEK

ELK-THOMPSON, Siskiyou, CA

Built 1989 ADT: 5

NO DATA ENTERED

Good

Over: MILL CREEK

INDIAN, Siskiyou, CA

Built 1975 ADT: 40

NO DATA ENTERED

Good

Over: LITTLE ELK CREEK

ELK THOMPSON, Siskiyou, CA

Built 2004 ADT: 50

METHODIST CK ROAD

Good

Over: METHODIST CREEK

FORKS, Siskiyou, CA

Built 1966 ADT: 20

NO DATA ENTERED

Good

Over: SIGN CREEK

FORKS OF SALMON, Siskiyou, CA

Built 2005 ADT: 50

NO DATA ENTERED

Good

Over: CECIL CREEK

CECILVILLE, Siskiyou, CA

Built 2004 ADT: 50

NO DATA ENTERED

Good

Over: S FK TAYLOR CREEK

CECILVILLE, Siskiyou, CA

Built 2005 ADT: 50

SHACKLEFORD CK RD

Good

Over: SHACKLEFORD CREEK

SCOTT BAR, Siskiyou, CA

Built 1992 ADT: 50

NO DATA ENTERED

Good

Over: S FK SCOTT RIVER

CALLAHAN, Siskiyou, CA

Built 2003 ADT: 50

NO DATA ENTERED

Good

Over: BOULDER CREEK

SCOTT BAR, Siskiyou, CA

Built 2005 ADT: 50

NO DATA ENTERED

Good

Over: MILL CREEK

SCOTT BAR, Siskiyou, CA

Built 2003 ADT: 50

NO DATA ENTERED

Good

Over: SCOTT BAR MILL CREEK

SCOTT BAR, Siskiyou, CA

Built 2003 ADT: 50

NO DATA ENTERED

Good

Over: SCOTT BAR MILL CREEK

SCOTT BAR, Siskiyou, CA

Built 2003 ADT: 50

NO DATA ENTERED

Good

Over: E FK S FK SALMON RIVER

CALLAHAN, Siskiyou, CA

Built 2005 ADT: 50

BRIDGE CREEK ROAD

Good

Over: HAYPRESS CREEK

UKONOM, Siskiyou, CA

Built 1967 ADT: 50

ROCK SHANTY ROAD

Good

Over: ROCK CREEK

UKONOM, Siskiyou, CA

Built 1966 ADT: 50

ROCK SHANTY ROAD

Good

Over: BARK SHANTY GULCH

UKONOM, Siskiyou, CA

Built 1960 ADT: 50

RED HILL

Good

Over: UNNAMED CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1982 ADT: 50

DEER CREEK

Good

Over: DEER CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1975 ADT: 50

BARTLE GAP

Good

Over: MOOSEHEAD CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1985 ADT: 50

RACCOON CREEK

Good

Over: MCCLOUD RIVER

NO DATA ENTERED, Siskiyou, CA

Built 1955 ADT: 50

WHISKEY CREEK

Good

Over: TATE CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1983 ADT: 50

CLEAR CREEK ROAD

Good

Over: FIVEMILE CREEK

CLEAR CREEK, Siskiyou, CA

Built 1950 Load: 9.7 t ADT: 50

CLEAR CREEK ROAD

Good

Over: FOURMILE CREEK

CLEAR CREEK, Siskiyou, CA

Built 1950 Load: 11.3 t ADT: 50

SOUTH FORK

Good

Over: SO. FK. SACRAMENTO RIVER

NO DATA ENTERED, Siskiyou, CA

Built 1966 Load: 15.6 t ADT: 50

HWY 99-97 CUTOFF

Good

Over: SHASTA RIVER

1.1 MI E/O MONTAGUE GNADA, Siskiyou, CA

Built 1955 Load: 16.2 t ADT: 2,685

WALKER CREEK ROAD

Good

Over: WALKER CREEK

HORSE, Siskiyou, CA

Built 1975 Load: 16.8 t ADT: 50

AGER RD

Good

Over: KLAMATH RIVER, CORP RR

S OF COPCO RD, Siskiyou, CA

Built 1976 Load: 17.2 t ADT: 617

CLEAR CREEK ROAD

Good

Over: CLEAR CREEK

CLEAR CREEK, Siskiyou, CA

Built 1951 Load: 17.8 t ADT: 50

FIRST STREET

Good

Over: SACRAMENTO RIVER

1.5 MI S SHERRER AV, Siskiyou, CA

Built 1965 Load: 18.1 t ADT: 316

SOUTH RUSSIAN ROAD

Good

Over: RUSSIAN CREEK

SAWYERS BAR, Siskiyou, CA

Built 1966 Load: 18.5 t ADT: 50

CECILVILLE ROAD

Good

Over: MATHEWS CREEK

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

Built 1940 Load: 19.1 t ADT: 101

STATE ROUTE 96

Good

Over: SEIAD CREEK

02-SIS-096-60.17, Siskiyou, CA

Built 1953 Load: 21.1 t ADT: 615

INTERSTATE 5

Good

Over: SACRAMENTO,UP RR,AMTRAK

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

Built 1955 Load: 21.4 t ADT: 18,000

SCARFACE RD

Good

Over: MOFFETT CREEK

0.1 MI W MOFFETT CR RD, Siskiyou, CA

Built 1967 Load: 21.4 t ADT: 4

MONTAGUE GRENADA

Good

Over: JULIEN CREEK

0.4 MI N OF SH 3, Siskiyou, CA

Built 1974 Load: 22.4 t ADT: 1,153

RED HILL

Good

Over: S. FK. SACRAMENTO RIVER

NO DATA ENTERED, Siskiyou, CA

Built 1972 Load: 22.4 t ADT: 50

INTERSTATE 5 SB

Good

Over: CORP RR & SISKIYOU AVE

02-SIS-005-R36.72, Siskiyou, CA

Built 1967 Load: 22.7 t ADT: 7,850

RAMP/CONNECTOR 96

Good

Over: KLAMATH RIVER

02-SIS-096-105.61, Siskiyou, CA

Built 1968 Load: 23.3 t ADT: 730

INTERSTATE 5 NB

Good

Over: CORP RR & SISKIYOU AVE

02-SIS-005-R36.74, Siskiyou, CA

Built 1967 Load: 23.7 t ADT: 7,850

SCOTT RIVER RD

Good

Over: TOMPKINS CREEK

4 MI N KELSEY CREEK RD, Siskiyou, CA

Built 1965 Load: 23.7 t ADT: 39

STATE ROUTE 96

Good

Over: SANDY BAR CREEK

02-SIS-096-R9.11, Siskiyou, CA

Built 1942 Load: 24.3 t ADT: 330

INTERSTATE 5

Good

Over: YREKA CREEK

02-SIS-005-R46.79-YRE, Siskiyou, CA

Built 1970 Load: 24.3 t ADT: 16,600

INTERSTATE 5 SB

Good

Over: CORP RR & EDGEWOOD RD

02-SIS-005-R25.22, Siskiyou, CA

Built 1967 Load: 24.9 t ADT: 7,400

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.