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)

SHERMAN VALLEY RD

Good

Over: WADDELL CREEK

0.75 m N of Waddell Cr Rd, Thurston, WA

Built 1982 Load: 38.1 t ADT: 352

SCHOOL LAND ROAD

Good

Over: OVERFLOW CHANNEL

1.5NW ROCHESTER, Thurston, WA

Built 1981 Load: 38.1 t ADT: 381

SR 121

Good

Over: BLOOMS DITCH

4.0 E JCT I-5, Thurston, WA

Built 2016 Load: 38.6 t ADT: 2,711

Gate Rd

Good

Over: Baker Creek

0.52 S. of Mima Creek, Thurston, WA

Built 2021 Load: 38.9 t ADT: 508

MUD BAY ROAD

Good

Over: MUD BAY

0.20 E Jct SR101, Thurston, WA

Built 1978 Load: 39.0 t ADT: 12,249

BARBOUILLAT STREET

Good

Over: OVERFLOW

0.5 WEST MIMA ROAD, Thurston, WA

Built 1999 Load: 39.0 t ADT: 50

SR 507

Good

Over: YELM CREEK

1.2 N JCT SR 510, Thurston, WA

Built 1986 Load: 39.9 t ADT: 14,693

NB I-5

Good

Over: PRAIRIE CREEK

2.4 N LEWIS CO, Thurston, WA

Built 2009 Load: 39.9 t ADT: 34,801

PRATHER ROAD SW

Good

Over: CHEHALIS RIVER

1.4 m W of Old Hwy99, Thurston, WA

Built 1988 Load: 39.9 t ADT: 620

SR 510

Good

Over: NP RY

3.9 E JCT I-5, Thurston, WA

Built 1970 Load: 40.8 t ADT: 12,915

US 12, MOON RD

Good

Over: SLOUGH

1.0 E GRAYS HBR CO, Thurston, WA

Built 1999 Load: 40.8 t ADT: 9,817

OLD HWY 99

Good

Over: PRAIRIE CREEK

1. S JCT I-5, Thurston, WA

Built 2010 Load: 40.8 t ADT: 11,240

NOSCHKA ROAD

Good

Over: NOSKI CREEK

0.65 MI. W. OF WADDELL RD, Thurston, WA

Built 2011 Load: 40.8 t ADT: 51

LITTLEROCK ROAD

Good

Over: SALMON CREEK

3.0 NW JCT SR 121, Thurston, WA

Built 2014 Load: 40.8 t ADT: 6,458

BEAVER CREEK ROAD

Good

Over: BEAVER CREEK

0.88 m from Hwy 121, Thurston, WA

Built 2017 Load: 40.8 t ADT: 430

BLK-BELMORE RD.

Good

Over: BLACK LAKE DRAINAGE DITC

N END BLACK LK, Thurston, WA

Built 1992 Load: 41.7 t ADT: 5,172

INDEPENDENCE RD

Good

Over: STREAM

0.55 N OF GRAYS COUNTY LI, Thurston, WA

Built 2010 Load: 41.7 t ADT: 888

BALD HILLS ROAD

Good

Over: LACKAMAS CREEK

7.7 m S Baldhills Rd, Thurston, WA

Built 2006 Load: 42.6 t ADT: 3,480

CASE RD EXT

Good

Over: ALLEN CREEK

0.6 m S of 113th Ave SW, Thurston, WA

Built 2007 Load: 42.6 t ADT: 28

SR 507

Good

Over: SKOOKUMCHUCK RIVER

0.7 N LEWIS CO, Thurston, WA

Built 1971 Load: 43.5 t ADT: 2,823

MARTIN WAY E

Good

Over: SLOUGH

.19 m SW of Nisqually Cut, Thurston, WA

Built 2000 Load: 44.4 t ADT: 17,895

SB I-5

Good

Over: PRAIRIE CREEK

2.4 N LEWIS CO, Thurston, WA

Built 2010 Load: 45.4 t ADT: 34,801

MCLANE DELPHI ROAD

Good

Over: MCLANE CREEK

50 yd S of Mckenz Rd intr, Thurston, WA

Built 1992 Load: 45.4 t ADT: 2,686

STEIACOOM ROAD

Good

Over: HARTMAN CREEK

1 MILE E DUTERROW INT, Thurston, WA

Built 2001 Load: 46.3 t ADT: 1,001

188th Ave SW

Good

Over: OVERFLOW

1st Bridge E of Casino, Thurston, WA

Built 2002 Load: 46.3 t ADT: 1,114

128TH AV SW

Good

Over: UNNAMED STREAM

0.08 MILE W LITTLEROCK RD, Thurston, WA

Built 2007 Load: 46.3 t ADT: 3,047

SR 510

Good

Over: BNSF RAILROAD

4.1 E JCT I-5, Thurston, WA

Built 1970 Load: 47.2 t ADT: 12,915

PLEASANT GLADE RD

Good

Over: WOODLAND CREEK

0.85 m E of SleaterKinney, Thurston, WA

Built 2003 Load: 48.1 t ADT: 420

LITTLE ROCK RD

Good

Over: BEAVER CREEK

6.9 JCT SR 12, Thurston, WA

Built 1951 Load: 49.0 t ADT: 3,577

US 12

Good

Over: CMSTPP RR

7.7 E GRAYS HBR CO, Thurston, WA

Built 2011 Load: 49.0 t ADT: 22,939

188 SW

Good

Over: OVERFLOW CHANNEL

2nd Bridge E of Casino, Thurston, WA

Built 2002 Load: 49.9 t ADT: 1,114

REEDER ROAD N

Good

Over: BEAVER CREEK

.13 m N of Maytown Rd, Thurston, WA

Built 2021 Load: 49.9 t ADT: 10

US 101 SB

Good

Over: DESCHUTES PARKWAY

5.8 E JCT SR 8, Thurston, WA

Built 1987 Load: 50.8 t ADT: 30,207

SUMMIT LAKE ROAD

Good

Over: KENNEDY CREEK

0.2 m East of SR8, Thurston, WA

Built 1985 Load: 51.7 t ADT: 671

JAMES ROAD

Good

Over: OVERFLOW CHANNEL

1. S JCT SR12, Thurston, WA

Built 1985 Load: 52.6 t ADT: 1,265

JAMES ROAD SW

Good

Over: SCATTER CREEK

0.46 m W of Denmark Rd, Thurston, WA

Built 1982 Load: 52.6 t ADT: 1,265

143RD AVE S W

Good

Over: SCATTER CREEK

0.25 m N jct. SR 507, Thurston, WA

Built 1987 Load: 52.6 t ADT: 1,256

123RD. S.W.

Good

Over: BLACK RIVER

0.37m W of Littlerock Rd, Thurston, WA

Built 1986 Load: 52.6 t ADT: 229

Mullen Road

Good

Over: CREEK

.7 mi. W of Marvin Rd, Thurston, WA

Built 1999 Load: 52.6 t ADT: 7,703

WADDELL CREEK RD.

Good

Over: STONEY CREEK

00.3W DELPHI Rd, Thurston, WA

Built 1976 Load: 53.5 t ADT: 1,531

RICH ROAD

Good

Over: DESCHUTES RIVER

0.2 m E of Old Hwy 99, Thurston, WA

Built 1981 Load: 53.5 t ADT: 3,843

DELPHI ROAD SW

Good

Over: MCLANE CREEK

0.9 m S of SR101 overpass, Thurston, WA

Built 1993 Load: 53.5 t ADT: 2,686

MOON ROAD

Good

Over: OVERFLOW CHANNEL

.27 S JCT SR12, Thurston, WA

Built 1998 Load: 53.5 t ADT: 1,003

JOHNSON CREEK ROAD

Good

Over: JOHNSON CREEK

.4 m N Skookumchuck Rd, Thurston, WA

Built 1985 Load: 54.4 t ADT: 324

WILKENSEN ROAD

Good

Over: CENTRALIA CANAL

.3 m N of NorPacif Rd, Thurston, WA

Built 1986 Load: 55.3 t ADT: 5,357

MILITARY ROAD

Good

Over: DESCUTES RIVER

2. NW JCT SR507, Thurston, WA

Built 1984 Load: 58.0 t ADT: 911

W 4th Avenue

Good

Over: Budd Inlet W. Bay & BNRR

4th Avenue, Thurston, WA

Built 2004 Load: 58.0 t ADT: 20,060

175 TH S.W.

Good

Over: OVERFLOW CHANNEL

0.6 m W of Moon Rd, Thurston, WA

Built 1997 Load: 59.0 t ADT: 77

MORNINGSIDE DRIVE

Good

Over: SCATTER CREEK

.2 W JCT SR 507, Thurston, WA

Built 1995 Load: 61.7 t ADT: 26

SKOOKUMCHUCK ROAD

Good

Over: SKOOKUMCHUCK RIVER

5.SE JCT SR507, Thurston, WA

Built 1996 Load: 61.7 t ADT: 246

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

Related

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