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)

INTERSTATE 5 SB

Good

Over: KLAMATH RIVER ROAD

02-SIS-005-R58.10L, Siskiyou, CA

Built 1970 Load: 25.3 t ADT: 7,050

INTERSTATE 5

Good

Over: KLAMATH RIVER ROAD

02-SIS-005-R58.10R, Siskiyou, CA

Built 1970 Load: 25.3 t ADT: 7,050

INTERSTATE 5 NB

Good

Over: CORP RR & EDGEWOOD RD

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

Built 1967 Load: 25.6 t ADT: 7,400

SCOTT RIVER ROAD

Good

Over: SCOTT RIVER

0.3 MI S KELSEY CREEK RD, Siskiyou, CA

Built 1958 Load: 25.6 t ADT: 135

BUTTE ST

Good

Over: MOFFETT CREEK

0.05 MI WEST OF SH 3, Siskiyou, CA

Built 1988 Load: 25.9 t ADT: 400

NO DATA ENTERED

Good

Over: MID FK APPLEGATE

NO DATA ENTERED, Siskiyou, CA

Built 2016 Load: 26.2 t ADT: 75

ROAD

Good

Over: MID FK APPLEGATE

NO DATA ENTERED, Siskiyou, CA

Built 1969 Load: 26.3 t ADT: 10

BEAVER CREEK ROAD

Good

Over: WEST FORK BEAVER CREEK

BEAVER, Siskiyou, CA

Built 1972 Load: 26.9 t ADT: 50

AGER-BESWICH RD

Good

Over: WILLOW CREEK

EAST OF AGER RD, Siskiyou, CA

Built 1968 Load: 27.5 t ADT: 313

ROAD

Good

Over: COOK AND GREEN

NO DATA ENTERED, Siskiyou, CA

Built 1957 Load: 28.1 t ADT: 30

STATE ROUTE 3

Good

Over: SUGAR CREEK

02-SIS-003-11.29, Siskiyou, CA

Built 1958 Load: 28.2 t ADT: 925

STATE ROUTE 96

Good

Over: IRVING CREEK

02-SIS-096-R7.25, Siskiyou, CA

Built 1966 Load: 28.5 t ADT: 410

CANYON CREEK ROAD

Good

Over: CANYON CREEK

SCOTT BAR, Siskiyou, CA

Built 1966 Load: 28.5 t ADT: 50

MONTAGUE GRENADA

Good

Over: SHASTA RIVER

0.25 MI N OBERLIN RD, Siskiyou, CA

Built 1972 Load: 29.5 t ADT: 1,148

EDGEWOOD RD

Good

Over: SHASTA RIVER

0.1 MI E SLOUGH RD, Siskiyou, CA

Built 1969 Load: 30.1 t ADT: 395

STATE ROUTE 96

Good

Over: SALMON RIVER

02-SIS-096-R0.04, Siskiyou, CA

Built 1974 Load: 30.5 t ADT: 410

WILLOW CREEK RD

Good

Over: WILLOW CREEK

0.3 MI W OF SYLVA RD, Siskiyou, CA

Built 1968 Load: 31.4 t ADT: 41

KLAMATH RIVER ROAD

Good

Over: KLAMATH RIVER

SOUTH OF SH 96, Siskiyou, CA

Built 2014 Load: 31.8 t ADT: 200

STATE ROUTE 3

Good

Over: YREKA CREEK

02-SIS-003-L49.99-YRE, Siskiyou, CA

Built 1970 Load: 32.1 t ADT: 10,100

FOOTHILL DRIVE

Good

Over: YREKA CREEK

EAST OF HEARN CENTER, Siskiyou, CA

Built 1970 Load: 32.1 t ADT: 1,328

STATE ROUTE 3

Good

Over: SCOTT RIVER

02-SIS-003-31.68, Siskiyou, CA

Built 1956 Load: 32.4 t ADT: 2,750

STATE ROUTE 96

Good

Over: SWILLUP CREEK

02-SIS-096-23.25, Siskiyou, CA

Built 2002 Load: 32.4 t ADT: 360

STATE ROUTE 96

Good

Over: DOGGETT CREEK

02-SIS-096-82.67, Siskiyou, CA

Built 1953 Load: 32.4 t ADT: 650

STATE ROUTE 96 WB

Good

Over: HILLSIDE

02-SIS-096-R15.30, Siskiyou, CA

Built 2009 Load: 32.4 t ADT: 330

STATE ROUTE 96

Good

Over: FORT GOFF CREEK

02-SIS-096-55.96, Siskiyou, CA

Built 2015 Load: 32.4 t ADT: 615

STATE ROUTE 263

Good

Over: KLAMATH RIVER

02-SIS-263-57.10, Siskiyou, CA

Built 2021 Load: 32.4 t ADT: 990

STATE ROUTE 89

Good

Over: MUD CREEK

02-SIS-089-21.08, Siskiyou, CA

Built 2018 Load: 32.4 t ADT: 2,400

INTERSTATE 5 SB

Good

Over: UP RR & AMTRAK

02-SIS-005-R15.94, Siskiyou, CA

Built 2021 Load: 32.4 t ADT: 12,750

STATE ROUTE 3

Good

Over: MOFFETT CREEK

02-SIS-003-38.26, Siskiyou, CA

Built 2021 Load: 32.4 t ADT: 2,900

SAWYERS BAR RD

Good

Over: MILL CREEK

5.8 MI W OF SH 3, Siskiyou, CA

Built 1982 Load: 32.4 t ADT: 167

COPCO ROAD

Good

Over: KLAMATH RIVER

AGER BESWICK ROAD, Siskiyou, CA

Built 1988 Load: 32.4 t ADT: 133

MILL CREEK RD

Good

Over: SCOTT RIVER

E OF SCOTT RIVER RD, Siskiyou, CA

Built 1985 Load: 32.4 t ADT: 37

CECILVILLE ROAD

Good

Over: SOUTH FORK SALMON RIVER

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

Built 1987 Load: 32.4 t ADT: 100

W MOFFETT CREEK RD

Good

Over: MOFFETT CREEK

0.2 MI NE SR 3, Siskiyou, CA

Built 1990 Load: 32.4 t ADT: 59

JACKSON RANCH RD

Good

Over: CARRICK CREEK

1.1 MI W EDGEWOOD RD, Siskiyou, CA

Built 1982 Load: 32.4 t ADT: 120

WEST LOUIE RD

Good

Over: WILLOW CREEK

0.8 MI E OLD HIGHWAY 99, Siskiyou, CA

Built 1989 Load: 32.4 t ADT: 65

MASTERSON ROAD

Good

Over: EAST FORK SCOTT RIVER

1.2 MI S GAZELLE CALAHAN, Siskiyou, CA

Built 1999 Load: 32.4 t ADT: 185

CECILVILLE ROAD

Good

Over: CRAWFORD CREEK

E/O EDDYS GULCH ROAD, Siskiyou, CA

Built 1960 Load: 32.4 t ADT: 97

TENNANT RD

Good

Over: ANTELOPE CREEK

0.05 MI N LONG PRAIRIE R, Siskiyou, CA

Built 1988 Load: 32.4 t ADT: 104

OLD HWY 99

Good

Over: PARKS CREEK

3.1 MI NW I-5, Siskiyou, CA

Built 1994 Load: 32.4 t ADT: 1,005

LWER LTLE SHSTA RD

Good

Over: LITTLE SHASTA RIVER

0.2 MI E OF SOULE LANE, Siskiyou, CA

Built 1978 Load: 32.4 t ADT: 164

BAL MT & SHA RIV R

Good

Over: LITTLE SHASTA RIVER

6.6 MI E SNWDN HONEY GUL, Siskiyou, CA

Built 1988 Load: 32.4 t ADT: 28

ANDERSON GRADE RD

Good

Over: SHASTA RIVER

0.8 MI E SH 263, Siskiyou, CA

Built 1982 Load: 32.4 t ADT: 61

OREGON ST

Good

Over: GREENHORN CREEK

0.1 MI S GREENHORN RD, Siskiyou, CA

Built 1990 Load: 32.4 t ADT: 422

RAYMOND ST

Good

Over: YREKA CREEK

0.05 MI EAST OF SH 3, Siskiyou, CA

Built 1988 Load: 32.4 t ADT: 179

DIGGLES ST

Good

Over: MOFFETT CREEK

AT NEWTON ST, Siskiyou, CA

Built 1988 Load: 32.4 t ADT: 200

WESTSIDE RD

Good

Over: YREKA CREEK

0.25 MI W OF S.R. 3, Siskiyou, CA

Built 1993 Load: 32.4 t ADT: 1,328

SCOTT RIVER RD

Good

Over: DEEP CREEK

0.6 KM N KELSEY CREEK RD, Siskiyou, CA

Built 1999 Load: 32.4 t ADT: 77

WALKER ROAD

Good

Over: LITTLE HUMBUG CREEK

1.5 MI E WALKER RD CONN, Siskiyou, CA

Built 2000 Load: 32.4 t ADT: 68

FRONT ST

Good

Over: COTTONWOOD CREEK

0.05 MI E HORNBROOK RD, Siskiyou, CA

Built 2006 Load: 32.4 t ADT: 127

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.