Lassen County, CA

108 public highway bridges

Lassen County Bridge Snapshot

Lassen County, California contains 108 public highway bridges in the FHWA National Bridge Inventory. Roughly 25% are rated “Good,” 64.8% “Fair,” 8.3% “Poor,” and 8.3% 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.

108

Total Bridges

25%

Good

8.3%

Poor

8.3%

Structurally Deficient

Condition Distribution

Good

25% (27)

Fair

64.8% (70)

Poor

8.3% (9)

SD

8.3% (9)

All Bridges (108)

Sort:

U.S. HIGHWAY 395

Over: STATE ROUTE 70

02-LAS-395-R4.60, Lassen, CA

Built 1976 ADT: 4,200

U.S. HIGHWAY 395

Over: STATE ROUTE 70

02-LAS-395-R4.60, Lassen, CA

Built 1976 ADT: 4,200

CR 417(PUNKIN CTR)

Over: MUDDY SLOUGH NO 2

2.6 MI S CR A2, Lassen, CA

Built 1955 ADT: 200

ROAD 30N06

Over: SUSAN RIVER

NO DATA ENTERED, Lassen, CA

Built 1976 ADT: 20

RD 304

Over: WHITEHEAD SLOUGH

0.9 MI E/O RD 302, Lassen, CA

Built 1930 Load: 6.5 t ADT: 100

RD 318

Over: SUSAN RIVER

1.7 MI E/O RD 305, Lassen, CA

Built 1975 Load: 10.7 t ADT: 100

CR306 (CAPEZOLLI)

Over: WHITEHEAD SLOUGH

0.3 MI E OF GALEPPI RD, Lassen, CA

Built 1950 Load: 11.7 t ADT: 100

RD 304 (ALEXANDER)

Over: SOUTH FORK DILL SLOUGH

1.1 MI E/O ROAD 302, Lassen, CA

Built 1930 Load: 12.0 t ADT: 100

RD 305 (MAPES RD)

Over: SUSAN RIVER OVERFLOW #6

1.7 MI E/O RD 304, Lassen, CA

Built 1978 Load: 14.6 t ADT: 100

CR527 (ASH VALLEY)

Over: NO NAME CREEK

3 MI W OF SPOONER ROAD, Lassen, CA

Built 1990 Load: 16.2 t ADT: 160

SCOTT ROAD

Over: LONG VALLEY CREEK

0.8 MI WEST OF US HWY 395, Lassen, CA

Built 1975 Load: 16.5 t ADT: 100

EAGLE LAKE RD

Over: PINE CREEK

10.6 MI S.W. OF SR 139, Lassen, CA

Built 1965 Load: 17.5 t ADT: 100

TRAVIS LANE

Over: BROCKMAN SLOUGH

.3 MI E/O JOHNSTONVILLE R, Lassen, CA

Built 1981 Load: 17.5 t ADT: 100

U.S. HIGHWAY 395

Over: SUSAN RIVER OVERFLOW

02-LAS-395-R71.92, Lassen, CA

Built 1992 Load: 20.4 t ADT: 1,700

SCOTT RD

Over: SCOTT CREEK

2.0 MI S OF SR 70, Lassen, CA

Built 1954 Load: 20.4 t ADT: 50

U.S. HIGHWAY 395

Over: DILL SLOUGH

02-LAS-395-R71.17, Lassen, CA

Built 1992 Load: 20.7 t ADT: 1,700

RD 305

Over: SUSAN RIVER OVERFLOW #8

1.6 MI SOUTH OF US 395, Lassen, CA

Built 1971 Load: 21.4 t ADT: 200

CENTER RD

Over: WILLOW CREEK

JUST EAST OF BELFAST RD, Lassen, CA

Built 1975 Load: 21.7 t ADT: 600

RD 315

Over: SUSAN RIVER

0.6 MI S OF CR 215, Lassen, CA

Built 1987 Load: 22.4 t ADT: 100

RD 303 (GALEPPI)

Over: HARTSON SLOUGH

0.5 MI N/O RD 305, Lassen, CA

Built 1978 Load: 22.4 t ADT: 100

BIEBER LOOKOUT RD

Over: ASH CREEK

2.3 MI N OF S.H. 299, Lassen, CA

Built 1966 Load: 22.7 t ADT: 800

RD 304

Over: SOUTH FORK DILL SLOUGH

0.5 MI N/O RD 306, Lassen, CA

Built 1978 Load: 23.3 t ADT: 100

COUNTY ROAD 311

Over: DEEP CUT (BAXTER) CREEK

1.3 MI E OF CR A3, Lassen, CA

Built 1978 Load: 23.3 t ADT: 100

C.R. 353

Over: BROWNELL CREEK

0.2 MI N/E US HWY 395, Lassen, CA

Built 1923 Load: 24.3 t ADT: 200

C.R. 353

Over: MCCLAY CREEK

1.3 MI NE OF US HWY 395, Lassen, CA

Built 1923 Load: 24.3 t ADT: 200

C.R. 353

Over: PARKER CREEK

0.5 MI N/W CR 301, Lassen, CA

Built 1923 Load: 24.3 t ADT: 50

JOHNSTONVILLE RD

Over: LASSEN CREEK

0.1 MI NW OF US 395, Lassen, CA

Built 1924 Load: 24.3 t ADT: 600

JOHNSTONVILLE RD

Over: SAND SLOUGH

0.2 MI N OF US 395, Lassen, CA

Built 1922 Load: 24.3 t ADT: 200

C.R. 301

Over: BAXTER CREEK

1.8 MI NE OF SH 395, Lassen, CA

Built 1970 Load: 24.3 t ADT: 1,200

SURPRISE VALLEY RD

Over: BARE CREEK

1.8 MI S OF MODOC C.L., Lassen, CA

Built 1965 Load: 24.3 t ADT: 400

ROAD 30N03

Over: SUSAN RIVER

14 MI W SUSANVILLE, Lassen, CA

Built 1972 Load: 25.3 t ADT: 20

STATE ROUTE 299

Over: PIT RIVER OVERFLOW

02-LAS-299-13.40, Lassen, CA

Built 1925 Load: 25.6 t ADT: 1,800

STATE ROUTE 299

Over: PIT RIVER OVERFLOW

02-LAS-299-13.61, Lassen, CA

Built 1925 Load: 25.6 t ADT: 1,800

STATE ROUTE 299

Over: PIT RIVER OVERFLOW

02-LAS-299-12.82, Lassen, CA

Built 1925 Load: 25.9 t ADT: 1,800

STATE ROUTE 299

Over: PIT RIVER

02-LAS-299-14.06, Lassen, CA

Built 1925 Load: 25.9 t ADT: 1,800

RD 304

Over: HARTSON SLOUGH

0.7 MI E/O RD 302, Lassen, CA

Built 1978 Load: 26.2 t ADT: 100

CR213 (LEAVITT LN)

Over: SUSAN RIVER

0.3 MI N OF US 395, Lassen, CA

Built 1970 Load: 26.2 t ADT: 100

C.R. 203

Over: GOLD RUN CREEK

4.2 MI S OF SR 36, Lassen, CA

Built 1967 Load: 28.8 t ADT: 600

C.R. 203

Over: LASSEN CREEK

6.8 MI SE OF SR 36, Lassen, CA

Built 1967 Load: 28.8 t ADT: 600

RD 306 (CAPEZOLLI)

Over: HARTSON SLOUGH

1.2 MI E/O RD 302, Lassen, CA

Built 1979 Load: 29.8 t ADT: 100

STATE ROUTE 70

Over: UP RR

02-LAS-070-1.16, Lassen, CA

Built 1953 Load: 30.8 t ADT: 4,200

CR213 (LEAVITT LN)

Over: SUSAN RIVER OVERFLOW

0.65 MI N OF US 395, Lassen, CA

Built 1973 Load: 30.8 t ADT: 100

STATE ROUTE 299

Over: PIT RIVER OVERFLOW

02-LAS-299-13.12, Lassen, CA

Built 1925 Load: 31.4 t ADT: 1,800

U.S. HIGHWAY 395

Over: UP RR & BNSF RY

02-LAS-395-R22.97, Lassen, CA

Built 1969 Load: 31.4 t ADT: 5,500

STATE ROUTE 299

Over: PIT RIVER OVERFLOW

02-LAS-299-12.27, Lassen, CA

Built 1925 Load: 32.1 t ADT: 1,800

GARNIER RD

Over: LONG VALLEY CREEK

2.0 MI N OF US HWY 395, Lassen, CA

Built 1956 Load: 32.1 t ADT: 500

U.S. HIGHWAY 395

Over: LONG VALLEY CREEK

02-LAS-395-15.87, Lassen, CA

Built 1956 Load: 32.4 t ADT: 5,500

STATE ROUTE 36

Over: SUSAN RIVER

02-LAS-036-R26.72, Lassen, CA

Built 1964 Load: 32.4 t ADT: 15,300

U.S. HIGHWAY 395

Over: LONG VALLEY CREEK

02-LAS-395-28.00, Lassen, CA

Built 1946 Load: 32.4 t ADT: 5,500

STATE ROUTE 70

Over: LONG VALLEY CREEK

02-LAS-070-1.97, Lassen, CA

Built 1952 Load: 32.4 t ADT: 4,200

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