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)

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.

Related

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