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:

NP RY

Over: STATE ROUTE 507

8.2 N LEWIS CO, Thurston, WA

Built 1935 ADT: 9,082

CMSTPP RR

Over: STATE ROUTE 507

18.0 N LEWIS CO, Thurston, WA

Built 1936 ADT: 8,095

CUSTER WAY

Over: I-5, DESCHUTES RIVER

4.7 N JCT SR 121, Thurston, WA

Built 1956 ADT: 99,802

I-5

Over: DESCHUTES PARKWAY

5.0 N JCT SR 121, Thurston, WA

Built 1956 ADT: 16,138

CAPITOL BLVD

Over: I-5, RAMP

0.7 N JCT US 101, Thurston, WA

Built 1956 ADT: 99,802

I-5 RAMPS

Over: HENDERSON BLVD, UPRR

1.2 N JCT US 101, Thurston, WA

Built 1957 ADT: 16,866

I-5 S-W RAMP

Over: HENDERSON BLVD, RR

1.2 N JCT US 101, Thurston, WA

Built 1957 ADT: 16,866

I-5

Over: HENDERSON BLVD

1.2 N JCT US 101, Thurston, WA

Built 1957 ADT: 10,302

DELPHI RD

Over: US 101

1.8 S JCT SR 8, Thurston, WA

Built 1958 ADT: 41,873

I-5

Over: PACIFIC AVE

3.4 N JCT US 101, Thurston, WA

Built 1957 ADT: 20,913

SR 8

Over: US 101

4.6 S MASON CO, Thurston, WA

Built 1958 ADT: 16,101

SR 8

Over: US 101

4.6 S MASON CO, Thurston, WA

Built 1958 ADT: 16,101

I-5

Over: MARTIN WAY

5.0 N JCT US 101, Thurston, WA

Built 1967 ADT: 48,714

I-5

Over: MARTIN WAY

5.0 N JCT US 101, Thurston, WA

Built 1967 ADT: 48,714

CARPENTER RD

Over: I-5

6.4 N JCT US 101, Thurston, WA

Built 1967 ADT: 113,497

MERIDIAN RD

Over: I-5

1.2 N JCT SR 510, Thurston, WA

Built 1968 ADT: 99,770

I-5

Over: MCALLISTER CR

2.2 N JCT SR 510, Thurston, WA

Built 1968 ADT: 1,912

I-5

Over: MCALLISTER CREEK

2.2 N JCT SR 510, Thurston, WA

Built 1968 ADT: 1,912

I-5 S-E RAMP

Over: I-5 MAINLINE

2.4 N JCT SR 510, Thurston, WA

Built 1968 ADT: 96,338

216TH AVE SW

Over: I-5, RR

0.8 N LEWIS CO, Thurston, WA

Built 1968 ADT: 69,601

183RD AVE SW

Over: I-5

1.5 N JCT US 12, Thurston, WA

Built 1968 ADT: 66,693

113TH AVE SW

Over: I-5

2.0 N JCT SR 121, Thurston, WA

Built 1968 ADT: 68,115

SR 121 / 93RD AVE

Over: I-5

JCT SR 121, Thurston, WA

Built 1968 ADT: 64,115

EVERGREEN PARKWAY

Over: US 101

2.4 S JCT SR 8, Thurston, WA

Built 1975 ADT: 41,873

COOPER PT RD

Over: US 101

5.0 S JCT SR 8, Thurston, WA

Built 1976 ADT: 71,170

2nd AVE SW

Over: US 101

1.2 S JCT SR 8, Thurston, WA

Built 1976 ADT: 40,428

BOULEVARD RD

Over: I-5

2.6 N JCT US 101, Thurston, WA

Built 1984 ADT: 136,911

14TH AVE

Over: I-5

1.2 N JCT US 101, Thurston, WA

Built 1986 ADT: 137,442

I-5 ON RAMP

Over: HENDERSON BLVD

1.2 N JCT US 101, Thurston, WA

Built 1986 ADT: 10,302

PLUM ST-N RAMP

Over: I-5

1.2 N JCT US 101, Thurston, WA

Built 1986 ADT: 118,213

SLEATER-KINNEY RD

Over: I-5

4.3 N JCT US 101, Thurston, WA

Built 1987 ADT: 128,811

TUMWATER BLVD

Over: I-5

2.0 N JCT SR 121, Thurston, WA

Built 1986 ADT: 69,251

I-5

Over: PACIFIC AVE.

3.3 N JCT US 101, Thurston, WA

Built 1988 ADT: 20,913

PEDESTRIANS

Over: I-5

2.7 N JCT SR 121, Thurston, WA

Built 1987 ADT: 83,796

COLLEGE ST

Over: I-5

4.8 N JCT US 101, Thurston, WA

Built 1988 ADT: 110,242

LILLY ROAD

Over: I-5

3.8 N JCT US 101, Thurston, WA

Built 1988 ADT: 128,811

EASTSIDE STREET

Over: I-5

1.2 N JCT US 101, Thurston, WA

Built 1988 ADT: 118,213

US 101 NB

Over: I-5, RAMPS, STREET

5.0 N JCT SR 121, Thurston, WA

Built 1990 ADT: 99,802

E-S RAMP

Over: S-S RAMP

5.0 N JCT SR 121, Thurston, WA

Built 1990 ADT: 2,866

KAISER ROAD

Over: US 101

2.6 S JCT SR 8, Thurston, WA

Built 1989 ADT: 41,873

TROSPER RD

Over: I-5

3.5 N JCT SR 121, Thurston, WA

Built 1991 ADT: 83,796

ISRAEL RD

Over: I-5

2.4 N JCT SR 121, Thurston, WA

Built 1990 ADT: 69,251

STEAMBOAT ISL RD

Over: US 101 & SCHNEIDER CREEK

2.7 S MASON CO, Thurston, WA

Built 1995 ADT: 26,046

SR 510 (MARVIN RD)

Over: I-5

7.7 N JCT US 101, Thurston, WA

Built 2001 ADT: 84,306

CHEHALIS PED TRAIL

Over: I-5

4.0 N JCT US 101, Thurston, WA

Built 2007 ADT: 128,811

I-5

Over: SR 121 & RAILROAD

JCT I-5, Thurston, WA

Built 2010 ADT: 3,914

US 12

Over: I-5

JCT US 12, Thurston, WA

Built 2011 ADT: 55,210

PEDESTRIANS

Over: CAPITOL WAY

CAPITOL WAY S, Thurston, WA

Built 1973 ADT: 16,088

BNRR Main Line

Over: RAINIER RD.

0.3 S 70th Way, Thurston, WA

Built 1920 ADT: 8,230

RAILROAD

Over: OLD 99

3.4 N JCT SR507, Thurston, WA

Built 1922 ADT: 6,729

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