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)

WHITES GULCH ROAD

Good

Over: WHITES GULCH

0.4 M S OF SAWYER BAR RD, Siskiyou, CA

Built 2009 Load: 32.4 t ADT: 25

EDGEWOOD ROAD

Good

Over: SHASTA RIVER

0.3 M SO STEWART SPRINGS, Siskiyou, CA

Built 2009 Load: 32.4 t ADT: 100

SAWYERS BAR ROAD

Good

Over: KELLY GULCH

3.2 M W OF EDDY GULCH RD., Siskiyou, CA

Built 2006 Load: 32.4 t ADT: 150

CHINA GRADE ROAD

Good

Over: HORSE CREEK

6.7 MI NE ELK CK ROAD, Siskiyou, CA

Built 2008 Load: 32.4 t ADT: 50

MINERS CREEK ROAD

Good

Over: FRENCH CREEK

0.1 MI E FRENCH CREEK RD, Siskiyou, CA

Built 1967 Load: 32.7 t ADT: 62

ROAD

Good

Over: ELLIOTT CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1969 Load: 32.7 t ADT: 15

SCOTT RIVER ROAD

Good

Over: MOFFETT CREEK

0.3 MI N STATE ROUTE 3, Siskiyou, CA

Built 1962 Load: 33.7 t ADT: 1,032

WHITES GULCH ROAD

Good

Over: NORTH FORK SALMON RIVER

S OF SAWYERS BAR RD, Siskiyou, CA

Built 1969 Load: 33.7 t ADT: 50

ELK CREEK ROAD

Good

Over: ELK CREEK

5.1 MI S OF SR96, Siskiyou, CA

Built 1967 Load: 34.3 t ADT: 293

OBERLIN RD (YREKA)

Good

Over: YREKA CREEK

0.1 MI E/O FAIRLANE RD, Siskiyou, CA

Built 1959 Load: 35.0 t ADT: 1,839

PETERSBURG RD

Good

Over: SOUTH FORK SALMON RIVER

0.1 MI S CALHN-CECILVL RD, Siskiyou, CA

Built 1969 Load: 35.0 t ADT: 29

YREKA AGER RD

Good

Over: SHASTA RIVER

1.25 MI NE OF SR 3, Siskiyou, CA

Built 1969 Load: 35.6 t ADT: 536

INDIAN CREEK ROAD

Good

Over: EAST FORK INDIAN CREEK

7.6 MI N OF SR 96, Siskiyou, CA

Built 1967 Load: 36.9 t ADT: 142

MINERS CREEK ROAD

Good

Over: MINERS CREEK

1.8 MI S FRENCH CREEK RD, Siskiyou, CA

Built 1968 Load: 36.9 t ADT: 62

DENNIS LANE

Good

Over: WILLOW CREEK

0.5 MI E OF AGER RD, Siskiyou, CA

Built 1969 Load: 37.3 t ADT: 20

WALKER ROAD

Good

Over: BARKHOUSE CREEK

1.05 MI E WALKER BR CONN, Siskiyou, CA

Built 1969 Load: 37.9 t ADT: 68

PONDOSA WAY

Good

Over: BEAR CREEK

0.8 MI N SR 89, Siskiyou, CA

Built 1977 Load: 37.9 t ADT: 39

CARIBOU ROAD

Good

Over: E FK OF S FK SALMON RIV

0.2 MI S CECILVILLE RD, Siskiyou, CA

Built 1965 Load: 38.2 t ADT: 100

QUARTZ VALLEY ROAD

Good

Over: SHACKLEFORD CREEK

AT DANGLE LANE, Siskiyou, CA

Built 2005 Load: 38.2 t ADT: 400

INTERSTATE 5

Good

Over: OAK STREET

02-SIS-005-1.79, Siskiyou, CA

Built 1960 Load: 39.9 t ADT: 18,000

INTERSTATE 5

Good

Over: GUYS GULCH

02-SIS-005-R39.27, Siskiyou, CA

Built 1969 Load: 39.9 t ADT: 8,300

INTERSTATE 5

Good

Over: WILLOW STREET

02-SIS-005-2.09-DMR, Siskiyou, CA

Built 1960 Load: 40.2 t ADT: 18,000

STATE ROUTE 96

Good

Over: LITTLE GRIDER CREEK

02-SIS-096-40.02, Siskiyou, CA

Built 1967 Load: 40.5 t ADT: 1,013

BAR ROAD

Good

Over: KLAMATH RIVER

AT SR 96, Siskiyou, CA

Built 1998 Load: 40.5 t ADT: 21

SALMON RIVER ROAD

Good

Over: MERRILL CREEK

SALMON RIVER ROAD, Siskiyou, CA

Built 2002 Load: 40.5 t ADT: 250

STATE ROUTE 96

Good

Over: BEAVER CREEK

02-SIS-096-88.26, Siskiyou, CA

Built 1932 Load: 41.5 t ADT: 650

INTERSTATE 5

Good

Over: JULIEN CREEK

02-SIS-005-R40.12, Siskiyou, CA

Built 1969 Load: 41.5 t ADT: 8,300

INTERSTATE 5

Good

Over: JULIEN CREEK

02-SIS-005-R40.12, Siskiyou, CA

Built 1969 Load: 41.5 t ADT: 8,300

GRIDER ROAD

Good

Over: WEST GRIDER CREEK

3 MI SW OF SR96, Siskiyou, CA

Built 1971 Load: 42.1 t ADT: 6

TENNANT RD

Good

Over: BUTTE CREEK

4.4 MI SE SR97, Siskiyou, CA

Built 1981 Load: 42.4 t ADT: 67

NO DATA ENTERED

Good

Over: WEST BRANCH INDIAN CK

INDIAN CREEK, Siskiyou, CA

Built 2010 Load: 42.8 t ADT: 32

DUZEL CREEK RD

Good

Over: MOFFETT CREEK

0.1 MI SW SCARFACE RD, Siskiyou, CA

Built 1971 Load: 43.1 t ADT: 15

RAIL CREEK ROAD

Good

Over: EAST FORK SCOTT RIVER

0.2 MI E CALLAHAN-GAZELLE, Siskiyou, CA

Built 1998 Load: 43.4 t ADT: 300

INDEPENDENCE ROAD

Good

Over: KLAMATH RIVER

CLEAR CREEK, Siskiyou, CA

Built 1966 Load: 43.7 t ADT: 50

INTERSTATE 5

Good

Over: DUNSMUIR AVE

02-SIS-005-3.84-DMR, Siskiyou, CA

Built 1976 Load: 44.1 t ADT: 19,200

INTERSTATE 5

Good

Over: SHASTA RIVER

02-SIS-005-R22.62, Siskiyou, CA

Built 1960 Load: 45.0 t ADT: 7,800

COPCO RD

Good

Over: BRUSH CREEK

5 MI E AGER RD, Siskiyou, CA

Built 1976 Load: 46.3 t ADT: 226

INTERSTATE 5

Good

Over: MOTT ROAD

02-SIS-005-5.90, Siskiyou, CA

Built 1976 Load: 46.7 t ADT: 20,000

INTERSTATE 5

Good

Over: SHASTA RIVER

02-SIS-005-R22.62, Siskiyou, CA

Built 1960 Load: 48.0 t ADT: 7,800

MASTERSON ROAD

Good

Over: EAST FORK SCOTT RIVER

2.4 MI W GAZELLE CALLAHAN, Siskiyou, CA

Built 1975 Load: 48.6 t ADT: 185

CECILVILLE ROAD

Good

Over: KNOWNOTHING CREEK

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

Built 1987 Load: 49.2 t ADT: 100

JOHNNY O'NEIL ROAD

Good

Over: HORSE CREEK

HORSE, Siskiyou, CA

Built 1975 Load: 49.6 t ADT: 30

NO DATA ENTERED

Good

Over: HORSE CREEK

HORSE, Siskiyou, CA

Built 1975 Load: 49.6 t ADT: 20

HORSE CR RD

Good

Over: BUCKHORN CREEK

1.2 MI N OF RTE 96, Siskiyou, CA

Built 1968 Load: 50.2 t ADT: 21

KLAMATH RIVER ROAD

Good

Over: HUMBUG CREEK

AT HUMBUG CREEK RD, Siskiyou, CA

Built 1975 Load: 66.4 t ADT: 20

STATE ROUTE 96

Good

Over: KLAMATH RIVER

02-SIS-096-R5.75, Siskiyou, CA

Built 1970 Load: 73.5 t ADT: 410

MASTERSONS ROAD

Good

Over: KANGAROO CREEK

1.5 MI W GAZELLE CALLAHAN, Siskiyou, CA

Built 1975 Load: 80.4 t ADT: 185

COPCO ROAD

Good

Over: COTTONWOOD CREEK

0.9 MI EAST OF I-5, Siskiyou, CA

Built 1980 Load: 85.5 t ADT: 390

SOUTH RUSSIAN ROAD

Good

Over: SOUTH RUSSIAN CREEK

SAWYERS BAR, Siskiyou, CA

Built 1968 Load: 90.8 t ADT: 20

STATE ROUTE 96

Good

Over: KLAMATH RIVER

02-SIS-096-R5.08, Siskiyou, CA

Built 1970 Load: 99.8 t ADT: 410

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