Thurston County, WA

216 public highway bridges

Thurston County Bridge Snapshot

Thurston County, Washington contains 216 public highway bridges in the FHWA National Bridge Inventory. Roughly 44.4% are rated “Good,” 30.1% “Fair,” 0.5% “Poor,” and 0.5% 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 WA 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.

216

Total Bridges

44.4%

Good

0.5%

Poor

0.5%

Structurally Deficient

Condition Distribution

Good

44.4% (96)

Fair

30.1% (65)

Poor

0.5% (1)

SD

0.5% (1)

All Bridges (216)

Sort:

N P RAILROAD

Over: MULLEN ROAD

.7 m W Marvin Rd, Thurston, WA

Built 1950 ADT: 5,211

PARKS PED. TRAIL

Over: YELM HIGHWAY

.5 m W of College St, Thurston, WA

Built 1998 ADT: 24,000

CHEHALIS WEST TR

Over: MARTINWAY

0.3 W OF SLEATER KINNEY, Thurston, WA

Built 2010 ADT: 24,466

CHEHALIS WESTRN TR

Over: PACIFIC AVE.

0.3 WEST OF SLEATER KINNE, Thurston, WA

Built 2014 ADT: 24,185

W 5TH AVENUE

Over: BNRR

5TH AVENUE, Thurston, WA

Built 1958 Load: 10.7 t ADT: 16,790

HOLMES ISD RD

Over: LONG LAKE

OVER LONG LAKE, Thurston, WA

Built 1962 Load: 16.3 t ADT: 177

I-5

Over: NISQUALLY OVERFLOW

2.7 N JCT SR 510, Thurston, WA

Built 1968 Load: 19.4 t ADT: 48,169

YELM HWY S.E.

Over: RAILROAD

Lacey Cily Limit, Thurston, WA

Built 1951 Load: 20.0 t ADT: 12,500

CAPITOL BOULEVARD

Over: DESCHUTES R. & OWRR&N R.

00.23 N. E STREET, Thurston, WA

Built 1936 Load: 20.0 t ADT: 14,881

5TH AVE

Over: CAPITOL LAKE

1.2 N I-5, Thurston, WA

Built 1948 Load: 24.5 t ADT: 19,640

DELPHI ROAD SW

Over: MCLANE CREEK

.15 m S of Cedar Flats Rd, Thurston, WA

Built 1924 Load: 25.4 t ADT: 2,612

STEAMBOAT IS. RD.

Over: TOTTEN INLET

STEAMBOAT ISLAND, Thurston, WA

Built 1982 Load: 25.4 t ADT: 146

US 12

Over: SLOUGH

2.6 E GRAYS HBR CO, Thurston, WA

Built 1926 Load: 27.2 t ADT: 11,343

US 12

Over: SLOUGH

1.5 E GRAYS HBR CO, Thurston, WA

Built 1926 Load: 27.5 t ADT: 9,817

I-5

Over: NISQUALLY RIVER

2.9 N JCT SR 510, Thurston, WA

Built 1967 Load: 29.9 t ADT: 61,580

SR 507

Over: NISQUALLY RIVER

2.4 N JCT SR 510, Thurston, WA

Built 1987 Load: 31.4 t ADT: 21,833

TONO ROAD

Over: SKOOKUMCHUCK RIVER

0.4 m E of Hwy 507, Thurston, WA

Built 1972 Load: 31.7 t ADT: 333

NISQUALLY CUTOFF

Over: OVERFLOW CHANNEL

.2 E JCT I5, Thurston, WA

Built 1936 Load: 31.7 t ADT: 5,226

OLD HWY NO. 9

Over: PRAIRIE CREEK

0.8 m NW Old Hwy 99, Thurston, WA

Built 1936 Load: 32.7 t ADT: 3,433

WOODARD BAY ROAD

Over: WOODARD BAY

0.6 m E Libby Rd, Thurston, WA

Built 1958 Load: 32.7 t ADT: 1,137

MOON ROAD

Over: BLACK RIVER

1. N JCT SR12, Thurston, WA

Built 1976 Load: 32.7 t ADT: 1,003

VAIL CUTOFF RD

Over: DESCHUTES RIVER

100 ft W Vail Loop Rd, Thurston, WA

Built 1956 Load: 32.7 t ADT: 1,079

I-5

Over: NISQUALLY OVERFLOW-SOUTH

2.7 N JCT SR 510, Thurston, WA

Built 1982 Load: 33.4 t ADT: 48,169

I-5

Over: NISQUALLY RIVER

2.9 N JCT SR 510, Thurston, WA

Built 1937 Load: 33.6 t ADT: 61,580

JOHNSON CREEK ROAD

Over: JOHNSON CREEK

1.8 m N Skookumchuck Rd, Thurston, WA

Built 1977 Load: 33.6 t ADT: 324

I-5

Over: MCALLISTER CR

2.2 N JCT SR 510, Thurston, WA

Built 1968 Load: 33.7 t ADT: 2,096

US 101

Over: SCHNEIDER CREEK

2.7 S MASON CO, Thurston, WA

Built 1958 Load: 34.5 t ADT: 13,023

LEITNER ST.

Over: SCATTER CREEK

0.33 m S of 176th Ave SW, Thurston, WA

Built 1978 Load: 34.5 t ADT: 282

COOPER POINT ROAD

Over: PERCIVAL CREEK AND BNRR

0.1 N EVERGREEN DR, Thurston, WA

Built 1986 Load: 34.7 t ADT: 24,550

I-5

Over: OWR N RR

1.0 N JCT US 101, Thurston, WA

Built 1957 Load: 36.3 t ADT: 137,442

US 101

Over: MUD BAY

1.3 S JCT SR 8, Thurston, WA

Built 1958 Load: 36.3 t ADT: 20,937

HENDERSON BLVD

Over: DESCHUTES RIVER

0.55 mile S Yelm Hwy, Thurston, WA

Built 1961 Load: 36.3 t ADT: 13,945

Madrona Beach Road

Over: PERRY CREEK

0.6 W Mud Bay Rd, Thurston, WA

Built 1958 Load: 36.3 t ADT: 1,325

STEILACOOM ROAD

Over: MCALLISTER CREEK

2.0 m S of I-5 on ramp, Thurston, WA

Built 1964 Load: 36.3 t ADT: 1,384

US 101

Over: MUD BAY

1.3 S JCT SR 8, Thurston, WA

Built 1958 Load: 36.9 t ADT: 20,937

188 SW

Over: OVERFLOW CHANNEL

700 ft W Marble St SW, Thurston, WA

Built 1981 Load: 38.1 t ADT: 291

SCH. LND. RD. CULV

Over: OVERFLOW CHANNEL

600' W Forstom St., Thurston, WA

Built 1981 Load: 38.1 t ADT: 345

ENDICOTT ROAD

Over: CREEK

0.6 m W of Delphi Int., Thurston, WA

Built 1958 Load: 38.6 t ADT: 458

US 12

Over: SCATTER CREEK

4.5 E GRAYS HBR CO, Thurston, WA

Built 1926 Load: 38.9 t ADT: 13,012

SR 507

Over: TACOMA RAIL RR

1.8 N JCT SR 510, Thurston, WA

Built 1982 Load: 39.0 t ADT: 14,693

BOSTON STREET

Over: DESCHUTES RIVER

00.10 S. CUSTER WAY, Thurston, WA

Built 1915 Load: 39.9 t ADT: 7,400

US 101

Over: PERCIVAL CR & BNRR

4.5 S JCT SR 8, Thurston, WA

Built 1995 Load: 40.8 t ADT: 37,225

CASE ROAD SW

Over: SCATTER CREEK

0.7 m N of 183rd Ave SW, Thurston, WA

Built 1965 Load: 40.8 t ADT: 2,751

SR 507

Over: DESCHUTES RIVER

15.0 N LEWIS CO, Thurston, WA

Built 1943 Load: 41.7 t ADT: 5,063

INDEPENDENCE ROAD

Over: CHEHALIS RIVER

Over the Chehalis River, Thurston, WA

Built 1976 Load: 42.6 t ADT: 1,409

LITTLEROCK RD.

Over: CREEK

3.9 N SR 12, Thurston, WA

Built 1951 Load: 43.5 t ADT: 3,164

OLD HWY 99 SW

Over: SCATTER CREEK

WEST OF TENINO NEAR TRAC, Thurston, WA

Built 1923 Load: 44.4 t ADT: 5,042

MARTIN WAY EAST

Over: MC ALLISTER CREEK

.23 m SW of Nisqually Cu, Thurston, WA

Built 2000 Load: 44.4 t ADT: 17,895

128TH AVE SW

Over: BLACK RIVER

.23 W OF LITTLEROCK RD, Thurston, WA

Built 1968 Load: 45.4 t ADT: 3,047

183RD SW

Over: SCATTER CREEK

0.5 m W of Sargent Rd Int, Thurston, WA

Built 1949 Load: 45.4 t ADT: 2,813

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 6, 2026