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)

NO DATA ENTERED

Fair

Over: BOULDER CREEK

CALLAHAN, Siskiyou, CA

Built 1967 ADT: 2

NO DATA ENTERED

Fair

Over: S FK SCOTT RIVER

CALLAHAN, Siskiyou, CA

Built 1995 ADT: 3

NO DATA ENTERED

Fair

Over: MILL CREEK

SCOTT BAR, Siskiyou, CA

Built 2000 ADT: 30

MILL CREEK ROAD

Fair

Over: MILL CREEK

SCOTT BAR, Siskiyou, CA

Built 1993 ADT: 50

NO DATA ENTERED

Fair

Over: KANGAROO CREEK

CALLAHAN, Siskiyou, CA

Built 2006 ADT: 50

NO DATA ENTERED

Fair

Over: TRAIL GULCH

CALLAHAN, Siskiyou, CA

Built 2005 ADT: 50

MARTIN DAIRY ROAD

Fair

Over: LITTLE SHASTA RIVER

GOOSENEST, Siskiyou, CA

Built 1970 ADT: 50

BLUE CANYON ROAD

Fair

Over: BUTTE CREEK

GOOSENEST, Siskiyou, CA

Built 1969 ADT: 50

ANTELOPE CK ROAD

Fair

Over: BUTTE CREEK

GOOSENEST, Siskiyou, CA

Built 1974 ADT: 50

NO DATA ENTERED

Fair

Over: ANTELOPE CREEK

GOOSENEST, Siskiyou, CA

Built 1969 ADT: 10

NO DATA ENTERED

Fair

Over: BUTTE CREEK

GOOSENEST, Siskiyou, CA

Built 1965 ADT: 10

TOAD LAKE

Fair

Over: MID. FK. SCRAMENTO RIVER

NO DATA ENTERED, Siskiyou, CA

Built 1966 ADT: 50

STOUTS MEADOW

Fair

Over: MCCLOUD RIVER

ALGOMA CAMPGROUND, Siskiyou, CA

Built 1940 ADT: 50

COW CREEK

Fair

Over: MCCLOUD RIVER

NO DATA ENTERED, Siskiyou, CA

Built 1969 ADT: 50

HORN LANE

Fair

Over: SCOTT RIVER

1.0 MI EAST OF SR 3, Siskiyou, CA

Built 1956 Load: 6.5 t ADT: 194

GRAYBACK ROAD

Fair

Over: INDIAN CREEK

INDIAN, Siskiyou, CA

Built 1965 Load: 6.8 t ADT: 50

WILDCAT CREEK ROAD

Fair

Over: SCOTT RIVER

0.1 MI E OF SR 3, Siskiyou, CA

Built 1909 Load: 9.7 t ADT: 20

CANYON CREEK ROAD

Fair

Over: SCOTT RIVER

SCOTT BAR, Siskiyou, CA

Built 1958 Load: 11.3 t ADT: 50

LOUIE ROAD

Fair

Over: SHASTA RIVER

4.0 MI N/E OF I-5, Siskiyou, CA

Built 1935 Load: 11.7 t ADT: 45

STATE ROUTE 96

Fair

Over: DILLON CREEK

02-SIS-096-R16.13, Siskiyou, CA

Built 1966 Load: 12.0 t ADT: 330

RAILROAD PARK ROAD

Fair

Over: LITTLE CASTLE CREEK

0.1 MI W OF I-5, Siskiyou, CA

Built 1960 Load: 13.0 t ADT: 126

ELLER LANE

Fair

Over: SCOTT RIVER

JUST EAST OF ISLAND RD, Siskiyou, CA

Built 1910 Load: 13.3 t ADT: 172

SACRAMENTO AVE

Fair

Over: SACRAMENTO RIVER

AT RIVER AVE, Siskiyou, CA

Built 1965 Load: 14.6 t ADT: 175

BAILEY HILL RD

Fair

Over: HUTTON CREEK

0.75 MI S/O RTE 5, Siskiyou, CA

Built 1915 Load: 15.6 t ADT: 25

SHOVEL CREEK ROAD

Fair

Over: SHOVEL CREEK

GOOSENEST, Siskiyou, CA

Built 1968 Load: 15.9 t ADT: 50

FAIRLANE RD

Fair

Over: JUNIPER CREEK

0.3 MI S OF WALTERS LN, Siskiyou, CA

Built 1923 Load: 16.2 t ADT: 171

OLD HIGHWAY 99

Fair

Over: HAY CREEK

0.1 MI S TRUITMAN LANE, Siskiyou, CA

Built 1923 Load: 16.2 t ADT: 1,005

BUTTERFLY AVE

Fair

Over: SACRAMENTO RIVER

W OF RIO BLANCO RD, Siskiyou, CA

Built 1915 Load: 17.2 t ADT: 320

PETERSBURG ROAD

Fair

Over: CECIL CREEK

.3 MI S/O CECILVILLE ROAD, Siskiyou, CA

Built 1967 Load: 17.2 t ADT: 29

CECILVILLE RD

Fair

Over: SHADOW CREEK

2 MI N/O EDDY GULCH ROAD, Siskiyou, CA

Built 1960 Load: 17.2 t ADT: 49

S FORK ROAD

Fair

Over: INDIAN CREEK

AT INDIAN CRK RD, Siskiyou, CA

Built 1965 Load: 17.2 t ADT: 58

EAST CALLAHAN ROAD

Fair

Over: EAST FORK SCOTT RIVER

0.2 M NE/O SR 3, Siskiyou, CA

Built 1956 Load: 17.5 t ADT: 213

CRAG VIEW DR

Fair

Over: LITTLE CASTLE CREEK

0.1 MI E I-5, Siskiyou, CA

Built 1917 Load: 17.8 t ADT: 20

PEACH ORCHARD ROAD

Fair

Over: MOFFETT CREEK

0.2 MI E SR 3, Siskiyou, CA

Built 1920 Load: 18.1 t ADT: 94

AGER BESWICK RD

Fair

Over: SHOVEL CREEK

3.4 MI E OF COPCO ROAD, Siskiyou, CA

Built 1977 Load: 18.1 t ADT: 37

YREKA WALKER RD

Fair

Over: HUMBUG CREEK

JUST S OF HUMBUG CREEK RD, Siskiyou, CA

Built 1957 Load: 18.1 t ADT: 56

FRENCH CREEK RD

Fair

Over: DUCK LAKE CREEK

6.2 MI S/O SR 3, Siskiyou, CA

Built 1987 Load: 18.1 t ADT: 100

FRENCH CREEK ROAD

Fair

Over: NORTH FORK FRENCH CREEK

2.9 MI S OF SR 3, Siskiyou, CA

Built 1975 Load: 18.5 t ADT: 245

BRIDGE STREET

Fair

Over: SACRAMENTO RIVER

WEST OF FIRST ST, Siskiyou, CA

Built 1965 Load: 19.4 t ADT: 1,104

BIG SPRINGS ROAD

Fair

Over: LITTLE SHASTA RIVER

.5 MI S LWR LTL SHASTA RD, Siskiyou, CA

Built 1959 Load: 20.1 t ADT: 45

COLD BOTTLE SPRING

Fair

Over: LITTLE SHASTA RIVER

GOOSENEST, Siskiyou, CA

Built 1970 Load: 20.1 t ADT: 20

QUARTZ VALLEY ROAD

Fair

Over: SCOTT RIVER

0.3 MI S SCOTT RIVER RD, Siskiyou, CA

Built 1967 Load: 20.4 t ADT: 329

HORSE CREEK ROAD

Fair

Over: SEIAD CREEK

HORSE, Siskiyou, CA

Built 1956 Load: 20.4 t ADT: 50

COPCO RD

Fair

Over: DRY CREEK

3.4 MI E OF AGER RD, Siskiyou, CA

Built 1960 Load: 21.1 t ADT: 226

CECILVILLE ROAD

Fair

Over: SOUTH FORK SCOTT RIVER

0.05 MI WEST OF S R 3, Siskiyou, CA

Built 1954 Load: 21.4 t ADT: 490

CANYON CREEK RD

Fair

Over: SCOTT RIVER

0.1 MI S/O SCOTT RIV RD, Siskiyou, CA

Built 1938 Load: 22.0 t ADT: 6

BOULDER CREEK RD

Fair

Over: CANYON CREEK

0.1 MI SW SCOTT RIVER RD, Siskiyou, CA

Built 1993 Load: 22.0 t ADT: 8

SUGAR CREEK ROAD

Fair

Over: MINERS CREEK

0.2 MI S MINER CREEK RD, Siskiyou, CA

Built 1976 Load: 22.0 t ADT: 41

SALMON RIVER ROAD

Fair

Over: SALMON RIVER

3.4 MI W/O SAWYERS BAR RD, Siskiyou, CA

Built 1966 Load: 22.7 t ADT: 72

FAY LANE

Fair

Over: SCOTT RIVER

0.5 MI E/O SR 3, Siskiyou, CA

Built 1975 Load: 22.7 t ADT: 136

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.