Lake County, CA

129 public highway bridges

Lake County Bridge Snapshot

Lake County, California contains 129 public highway bridges in the FHWA National Bridge Inventory. Roughly 27.1% are rated “Good,” 59.7% “Fair,” 7.8% “Poor,” and 7.8% 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.

129

Total Bridges

27.1%

Good

7.8%

Poor

7.8%

Structurally Deficient

Condition Distribution

Good

27.1% (35)

Fair

59.7% (77)

Poor

7.8% (10)

SD

7.8% (10)

All Bridges (129)

Sort:

HILL ROAD EAST

Over: STATE ROUTE 29

01-LAK-029-R43.75, Lake, CA

Built 1972 ADT: 13,450

LAKEPORT BLVD

Over: STATE ROUTE 29

01-LAK-029-R41.42, Lake, CA

Built 1972 ADT: 13,450

STATE ROUTE 29

Over: HILL ROAD

01-LAK-029-R46.68, Lake, CA

Built 1972 ADT: 30

STATE ROUTE 29

Over: HILL ROAD

01-LAK-029-R46.68, Lake, CA

Built 1972 ADT: 30

STATE ROUTE 29

Over: LUCERNE CUT-OFF

01-LAK-029-R47.85, Lake, CA

Built 1972 ADT: 30

STATE ROUTE 29

Over: LUCERNE CUT-OFF

01-LAK-029-R47.85, Lake, CA

Built 1972 ADT: 30

PARK WAY

Over: STATE ROUTE 29

01-LAK-029-R45.14, Lake, CA

Built 1972 ADT: 13,450

ROAD

Over: STREAM

EEL RIVER, Lake, CA

Built 1962 ADT: 50

RANCHERIA ROAD

Over: MIDDLE CREEK

0.5 MI W ELK MOUNTAIN RD, Lake, CA

Built 1958 Load: 12.0 t ADT: 315

WARDLAW ST

Over: SAINT HELENA CREEK

0.15 MI E SR 29 IN MIDLTN, Lake, CA

Built 1908 Load: 15.2 t ADT: 114

PETERSON LANE

Over: ADOBE CREEK

0.5 MI W ADOBE CREEK RD, Lake, CA

Built 1950 Load: 15.2 t ADT: 23

WITTER SPRINGS RD

Over: COOPER CREEK

0.6 MI N OF SR 20, Lake, CA

Built 1935 Load: 15.2 t ADT: 212

SCOTTS VALLEY ROAD

Over: HENDRICKS CREEK

0.14 W/O EICKHOFF RD, Lake, CA

Built 1925 Load: 15.6 t ADT: 594

BARTLETT SPRING RD

Over: BARTLETT CREEK

13.7 MI NE OF SR 20, Lake, CA

Built 1960 Load: 20.7 t ADT: 80

SODA BAY RD

Over: KELSEY CREEK

4.9 MI E/O SR 29, Lake, CA

Built 1961 Load: 21.4 t ADT: 2,108

FINLEY EAST ROAD

Over: ADOBE CREEK

0.1 MI E OF STONE DR, Lake, CA

Built 1970 Load: 22.0 t ADT: 309

COPSEY CREEK WAY

Over: COPSEY CREEK

0.05 MI W QUARTERHORSE LN, Lake, CA

Built 1965 Load: 22.7 t ADT: 200

SODA BAY RD

Over: ADOBE CREEK

2.7 MI E OF SR 29, Lake, CA

Built 1957 Load: 23.3 t ADT: 2,060

ELK MTN RD

Over: WEST FORK MIDDLE CREEK

8.74 MI N S.R. 20, Lake, CA

Built 1966 Load: 24.0 t ADT: 1,000

ROSE ANDERSON RD

Over: ANDERSON CREEK

ANDERSON SPRINGS RD, Lake, CA

Built 1945 Load: 24.0 t ADT: 104

MORGAN VALLEY RD

Over: COPSEY CREEK

1.0 MI E SR 29 & SR 53, Lake, CA

Built 1965 Load: 24.3 t ADT: 1,800

E HGHLND SPRING RD

Over: HIGHLAND CREEK

0.1 MI S HIGHLAND SPGS RD, Lake, CA

Built 1960 Load: 24.3 t ADT: 618

MARTIN ST

Over: FORBES CREEK

0.6 MI EAST OF SR 29, Lake, CA

Built 1970 Load: 24.3 t ADT: 1,046

KONOCTI

Over: SCHINDLER CREEK

0.05 MI W KEYES BLVD, Lake, CA

Built 1965 Load: 24.3 t ADT: 320

KONOCTI VIEW

Over: CLEAR LAKE OAKS CHANNEL

0.05 MI W LAKELAND ST, Lake, CA

Built 1965 Load: 24.3 t ADT: 150

BLUE HERON COURT

Over: CLEAR LAKE OAKS CHANNEL

0.05 MI SE ISLAND CIRCLE, Lake, CA

Built 1965 Load: 24.3 t ADT: 150

BLUE HERON COURT

Over: CLEAR LAKE OAKS CHANNEL

0.05 MI NW ISLAND CIRCLE, Lake, CA

Built 1965 Load: 24.3 t ADT: 60

ELK MTN RD

Over: OVERFLOW CHANNEL

1.38 MI N OF SR 20, Lake, CA

Built 1958 Load: 24.6 t ADT: 1,061

NICE-LUCERNE CUTOF

Over: RODMAN NARROWS(CLEAR LAK

1.2 MI E/O SR 29, Lake, CA

Built 1958 Load: 25.6 t ADT: 5,315

BOAT LAUNCH RMP RD

Over: COLE CREEK

CLEAR LAKE STATE PARK, Lake, CA

Built 1970 Load: 26.9 t ADT: 104

STATE ROUTE 29

Over: 11TH STREET

01-LAK-029-R42.68, Lake, CA

Built 1972 Load: 29.8 t ADT: 6,725

STATE ROUTE 29

Over: 11TH STREET

01-LAK-029-R42.68, Lake, CA

Built 1972 Load: 29.8 t ADT: 6,725

BIG VALLEY RD

Over: ADOBE CREEK

0.2 MI N THOMAS RD, Lake, CA

Built 1963 Load: 30.1 t ADT: 2,962

BIG CANYON RD

Over: PUTAH CREEK

0.5 MI N OF SR 175, Lake, CA

Built 1961 Load: 30.5 t ADT: 820

WITTER SPRINGS RD

Over: COOPER CREEK

WITTER SPR RD W/O EAST RD, Lake, CA

Built 1935 Load: 30.8 t ADT: 123

BIG CANYON RD

Over: BIG CANYON CREEK

8 MI NORTH OF SR 29, Lake, CA

Built 1930 Load: 32.1 t ADT: 208

STATE ROUTE 20

Over: NORTH FORK CACHE CREEK

01-LAK-020-37.07, Lake, CA

Built 1989 Load: 32.4 t ADT: 6,300

STATE ROUTE 29

Over: ROBINSON CREEK

01-LAK-029-50.82, Lake, CA

Built 1947 Load: 32.4 t ADT: 5,700

STATE ROUTE 20

Over: POLK JONES CATTLEPASS

01-LAK-020-9.41, Lake, CA

Built 1955 Load: 32.4 t ADT: 8,000

STATE ROUTE 29

Over: SCOTTS CREEK

01-LAK-029-52.11, Lake, CA

Built 1989 Load: 32.4 t ADT: 5,700

STATE ROUTE 29

Over: SEIGLER CREEK

01-LAK-029-20.37, Lake, CA

Built 1991 Load: 32.4 t ADT: 10,600

STATE ROUTE 29

Over: COLE CREEK

01-LAK-029-32.91, Lake, CA

Built 1959 Load: 32.4 t ADT: 10,350

SR 53

Over: CACHE CREEK

01-LAK-053-1.10, Lake, CA

Built 1997 Load: 32.4 t ADT: 8,500

STATE ROUTE 20

Over: PHIPPS CREEK

01-LAK-020-36.08, Lake, CA

Built 1993 Load: 32.4 t ADT: 6,300

LAKE ST

Over: CACHE CREEK

0.03 MI S/O DAM ROAD, Lake, CA

Built 1987 Load: 32.4 t ADT: 1,700

BIG VALLEY RD

Over: MCGOUGH SLOUGH

JUST SE ARGONAUT RD, Lake, CA

Built 1963 Load: 32.4 t ADT: 3,116

BIG VALLEY RD

Over: HILL CREEK

0.2 MI WEST OF FINLEY, Lake, CA

Built 1963 Load: 32.4 t ADT: 1,038

BURNS VALLEY RD

Over: BURNS VALLEY CREEK

NEAR CLEARLAKE HIGHLANDS, Lake, CA

Built 1990 Load: 32.4 t ADT: 1,200

JESSIE ST

Over: SEIGLER CANYON CREEK

0.1 MI E OF SR 53, Lake, CA

Built 1987 Load: 32.4 t ADT: 300

MERRITT ROAD

Over: KELSEY CREEK

500 FT E/O BIG VALLEY RD, Lake, CA

Built 2008 Load: 32.4 t ADT: 1,870

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