Siskiyou County, CA

423 public highway bridges

Siskiyou County Bridge Snapshot

Siskiyou County, California contains 423 public highway bridges in the FHWA National Bridge Inventory. Roughly 36.2% are rated “Good,” 49.6% “Fair,” 5.4% “Poor,” and 5.4% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in CA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

423
Total Bridges
36.2%
Good
5.4%
Poor
5.4%
Structurally Deficient

Condition Distribution

Good
36.2% (153)
Fair
49.6% (210)
Poor
5.4% (23)
SD
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

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial