Colusa County, CA

211 public highway bridges

Colusa County Bridge Snapshot

Colusa County, California contains 211 public highway bridges in the FHWA National Bridge Inventory. Roughly 37.4% are rated “Good,” 48.3% “Fair,” 6.2% “Poor,” and 6.2% 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.

211

Total Bridges

37.4%

Good

6.2%

Poor

6.2%

Structurally Deficient

Condition Distribution

Good

37.4% (79)

Fair

48.3% (102)

Poor

6.2% (13)

SD

6.2% (13)

All Bridges (211)

Sort:

STATE ROUTE 45

Over: HIGH DITCH

03-COL-045-4.05, Colusa, CA

Built 1980 Load: 28.5 t ADT: 1,000

PUTNUM WAY

Over: SALT CREEK

1 MI N OF HILLGATE RD, Colusa, CA

Built 1967 Load: 28.8 t ADT: 421

HAHN ROAD

Over: TEHAMA-COLUSA CANAL

1.3 MI W CORTINA SCHOL RD, Colusa, CA

Built 1976 Load: 28.8 t ADT: 122

CORTINA SCHOOL RD

Over: TEHAMA-COLUSA CANAL

0.8 MI S HAHN RD, Colusa, CA

Built 1976 Load: 28.8 t ADT: 185

HILLGATE ROAD

Over: TEHAMA-COLUSA CANAL

2.5 MI WEST OF I-5, Colusa, CA

Built 1976 Load: 28.8 t ADT: 645

MAXWELL-SITES RD

Over: STONE CORRAL CREEK

1.5 MI W MILL ORCHARD RD, Colusa, CA

Built 1957 Load: 29.2 t ADT: 462

LODOGA-STONYFRD RD

Over: STONY CREEK

IN STONYFORD, Colusa, CA

Built 1958 Load: 29.5 t ADT: 342

HAHN RD

Over: SOUTH BRANCH SAND CREEK

2.1 MI E OF OLD 99, Colusa, CA

Built 1969 Load: 30.1 t ADT: 1,541

STATE ROUTE 16

Over: BEAR CREEK

03-COL-016-R4.34, Colusa, CA

Built 1964 Load: 30.8 t ADT: 630

FOUR MILE RD

Over: HUNTERS CREEK

0.5 MI N OF DELEVAN RD, Colusa, CA

Built 1950 Load: 31.1 t ADT: 18

JENSEN AVE

Over: TEHAMA-COLUSA CANAL

0.3 MI S OF HILLGATE RD, Colusa, CA

Built 1976 Load: 31.1 t ADT: 124

REDDINGTON AVE

Over: TEHAMA-COLUSA CANAL

0.4 MI S OF HILLGATE RD, Colusa, CA

Built 1976 Load: 31.1 t ADT: 135

WILDWOOD RD

Over: TEHAMA-COLUSA CANAL

0.2 MI S OF WAGNER RD, Colusa, CA

Built 1976 Load: 31.1 t ADT: 1,018

DELPHOS ROAD

Over: LURLINE CREEK

0.5 MI S/O LURLINE AVE, Colusa, CA

Built 1971 Load: 31.4 t ADT: 22

INTERSTATE 5

Over: PETROLEUM CREEK

03-COL-005-R2.05, Colusa, CA

Built 1967 Load: 31.8 t ADT: 15,000

INTERSTATE 5

Over: PETROLEUM CREEK

03-COL-005-R2.05, Colusa, CA

Built 1967 Load: 31.8 t ADT: 18,000

INTERSTATE 5 NB

Over: SALT CREEK

03-COL-005-R7.99, Colusa, CA

Built 1952 Load: 32.1 t ADT: 15,000

DIRKS ROAD

Over: DIRKS CREEK

1.3 MI S OF GLEN CO LINE, Colusa, CA

Built 1960 Load: 32.1 t ADT: 114

STATE ROUTE 45

Over: WILKINS SLOUGH

03-COL-045-6.85, Colusa, CA

Built 1992 Load: 32.4 t ADT: 1,000

INTERSTATE 5

Over: FARM LAND DRAIN

03-COL-005-R1.14, Colusa, CA

Built 1968 Load: 32.4 t ADT: 30,000

STATE ROUTE 20

Over: BEAR CREEK

03-COL-020-3.28, Colusa, CA

Built 2009 Load: 32.4 t ADT: 5,400

FRESHWATER ROAD

Over: FRESHWATER CREEK

AT SCHAAD RD, Colusa, CA

Built 1968 Load: 32.4 t ADT: 252

GRIDLEY ROAD

Over: ANGEL SLOUGH

1.7 MI E BUTLER RD, Colusa, CA

Built 1973 Load: 32.4 t ADT: 541

LODOGA-SITES RD

Over: STONE CORRAL CREEK

9.6 MI WEST OF I-5, Colusa, CA

Built 1991 Load: 32.4 t ADT: 342

SITES-LODOGA ROAD

Over: HOWARD CREEK

15 MI WEST OF I-5, Colusa, CA

Built 1995 Load: 32.4 t ADT: 303

SAN JOSE ROAD

Over: LURLINE CREEK

0.5 MI N LURLINE RD, Colusa, CA

Built 1972 Load: 32.4 t ADT: 46

FOUR MILE ROAD

Over: STONE CORRAL CREEK

1.2 MI N MAXWELL RD, Colusa, CA

Built 1988 Load: 32.4 t ADT: 32

SAN JOSE ROAD

Over: FRESHWATER CREEK

0.6 MI NORTH OF SR 20, Colusa, CA

Built 1960 Load: 32.4 t ADT: 71

WILBUR SPRINGS RD

Over: SULPHUR CREEK

1 MI W/O BEAR VALLEY ROAD, Colusa, CA

Built 2001 Load: 32.4 t ADT: 20

GIBSON ROAD

Over: LURLINE CREEK

0.3 MI S/O LURLINE ROAD, Colusa, CA

Built 2001 Load: 32.4 t ADT: 33

FAIRVIEW ROAD

Over: GLENN-COLUSA CANAL

AT DANLEY ROAD, Colusa, CA

Built 2004 Load: 32.4 t ADT: 324

MCDERMOTT ROAD

Over: FUNKS CREEK

0.4 MI S LENAHAN RD, Colusa, CA

Built 2006 Load: 32.4 t ADT: 271

OHM RD

Over: SALT CREEK

0.5 MI SOUTH OF HAHN RD., Colusa, CA

Built 2006 Load: 32.4 t ADT: 105

LONE STAR ROAD

Over: GLENN-COLUSA CANAL

100 FT SOUTH OF WARE RD, Colusa, CA

Built 1968 Load: 32.7 t ADT: 2,417

LENAHAN ROAD

Over: FUNKS CREEK

0.2 MI E OF SUTTON ROAD, Colusa, CA

Built 1971 Load: 33.4 t ADT: 40

STATE ROUTE 16

Over: BEAR CREEK

03-COL-016-R3.35, Colusa, CA

Built 1964 Load: 33.7 t ADT: 630

LEESVILLE ROAD

Over: FRESHWATER CREEK

1.5 MI NW/O SR 20, Colusa, CA

Built 2000 Load: 34.0 t ADT: 20

INTERSTATE 5 SB

Over: SALT CREEK DR

03-COL-005-R7.70, Colusa, CA

Built 1967 Load: 35.0 t ADT: 15,000

INTERSTATE 5 NB

Over: SALT CREEK DR

03-COL-005-R7.70, Colusa, CA

Built 1967 Load: 35.0 t ADT: 15,000

ABEL ROAD

Over: COLUSA TROUGH

0.7 MI E OF OHM RD, Colusa, CA

Built 1966 Load: 35.3 t ADT: 83

GAIL AVE (OLD 99W)

Over: SALT CREEK

0.1 MI N OF GRIMES RD, Colusa, CA

Built 1967 Load: 35.6 t ADT: 5,151

INTERSTATE 5 SB

Over: SALT CREEK

03-COL-005-R7.99, Colusa, CA

Built 1967 Load: 36.0 t ADT: 15,000

EDDY ROAD

Over: CLARKS DITCH

1.9 MI E OF I-5, Colusa, CA

Built 1976 Load: 36.3 t ADT: 244

LA GRANDE RD

Over: GLENN VALLEY SLOUGH

1.0 MI W OF DANLEY RD, Colusa, CA

Built 1971 Load: 36.3 t ADT: 35

LODOGA-STONYFRD RD

Over: INDIAN CREEK

23.3 MI W/O 1-5, Colusa, CA

Built 1976 Load: 37.6 t ADT: 296

TWO MILE ROAD

Over: PAMELA CREEK

1.6 MI N OF LURLINE AVE, Colusa, CA

Built 1935 Load: 37.6 t ADT: 76

FIFTH ST (OLD 99W)

Over: ROSINA DRAW

9.9 MI N OF YOLO CO LINE, Colusa, CA

Built 1951 Load: 39.5 t ADT: 6,687

MAXWELL-SITES RD

Over: GLENN-COLUSA CANAL

0.8 MI W/O MCDERMOTT ROAD, Colusa, CA

Built 1968 Load: 39.5 t ADT: 613

MAXWELL ROAD

Over: STONE CORRAL CREEK

4.5 MI EAST OF I-5, Colusa, CA

Built 1971 Load: 40.8 t ADT: 2,306

INTERSTATE 5

Over: FRESHWATER CREEK

03-COL-005-R19.66, Colusa, CA

Built 1971 Load: 41.1 t ADT: 15,000

Read our methodology — how this data is sourced, computed, and verified.

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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 5, 2026