King County, WA

1,364 public highway bridges

King County Bridge Snapshot

King County, Washington contains 1,364 public highway bridges in the FHWA National Bridge Inventory. Roughly 31% are rated “Good,” 33.4% “Fair,” 3.3% “Poor,” and 3.3% 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 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.

1,364

Total Bridges

31%

Good

3.3%

Poor

3.3%

Structurally Deficient

Condition Distribution

Good

31% (423)

Fair

33.4% (456)

Poor

3.3% (45)

SD

3.3% (45)

All Bridges (1,364)

Sort:

I-5

Over: TERRAIN

5.2 N JCT SR 900, King, WA

Built 1966 Load: 28.2 t ADT: 94,901

NE 195TH STREET

Over: NORTH CREEK

0.1 E SR 405, King, WA

Built 1984 Load: 28.2 t ADT: 26,236

SW MT SI BLVD

Over: RIBARY CREEK

0.1 MI E OF SR-202, King, WA

Built 1989 Load: 28.2 t ADT: 1,900

SR 18 RAMP

Over: HOLDER CR

0.2 N JCT SR 18, King, WA

Built 1960 Load: 28.5 t ADT: 4,899

S-S RAMP

Over: 1ST AVE S

4.0 N JCT SR 518, King, WA

Built 1968 Load: 28.8 t ADT: 8,511

8TH STREET NE

Over: GREEN RIVER

0.4 MI E OF HARVEY RD, King, WA

Built 1973 Load: 28.8 t ADT: 21,100

56TH AVE SO

Over: DUWAMISH RIVER

0.1E INTERURBAN AVE, King, WA

Built 1985 Load: 28.8 t ADT: 2,900

NE 12TH ST

Over: BNRR

NE 12TH& 118TH NE, King, WA

Built 1970 Load: 28.8 t ADT: 15,309

US 2

Over: STREAM

5.6 E SNOHOMISH CO, King, WA

Built 1937 Load: 29.0 t ADT: 5,562

US 2

Over: STREAM

6.0 E SNOHOMISH CO, King, WA

Built 1937 Load: 29.0 t ADT: 5,562

SR 203

Over: DRAINAGE CHANNEL

7.7 N JCT SR 202, King, WA

Built 1954 Load: 29.0 t ADT: 9,561

I-5

Over: S 259TH PL

5.6 N JCT SR 18, King, WA

Built 1960 Load: 29.0 t ADT: 100,551

SR 167

Over: NP RY

1.4 N JCT SR 516, King, WA

Built 1967 Load: 29.0 t ADT: 59,986

SR 167

Over: NP RY

1.4 N JCT SR 516, King, WA

Built 1967 Load: 29.0 t ADT: 59,986

S JACKSON ST

Over: Parking garage

S Jackson St EO 4th Ave S, King, WA

Built 1910 Load: 29.0 t ADT: 15,000

5TH AVE S

Over: ST TUNNEL

5th Ave S SO S Jackson St, King, WA

Built 1910 Load: 29.0 t ADT: 8,000

15TH AVE W

Over: SHIP CANAL, RR

4300 15th Ave W, King, WA

Built 1940 Load: 29.0 t ADT: 52,000

SE 66TH ST

Over: NORTH FORK ISSAQUAH CRK

0.2 MI N OF I-90, King, WA

Built 1973 Load: 29.2 t ADT: 2,350

UPPER PRESTON RD

Over: RAGING RIVER

0.2 MI N OF I-90, King, WA

Built 1974 Load: 29.2 t ADT: 1,138

FOREST DR

Over: COAL CREEK

FOREST DR & 152ND, King, WA

Built 1989 Load: 29.5 t ADT: 3,505

S 180TH ST

Over: GREEN RIVER

0.1 MI W JCT SR-181, King, WA

Built 1968 Load: 29.8 t ADT: 15,698

OLD CASCADE HWY

Over: MARTIN CEEK

0.2 MI S OF SR-2, King, WA

Built 1959 Load: 29.8 t ADT: 60

SR 509

Over: JOES CREEK

2.1 N PIERCE CO, King, WA

Built 1929 Load: 29.9 t ADT: 3,821

SR 203

Over: SLOUGH

0.3 N JCT SR 202, King, WA

Built 1945 Load: 29.9 t ADT: 7,622

I-5

Over: S 336TH ST

0.8 N JCT SR 18, King, WA

Built 1959 Load: 29.9 t ADT: 89,140

SR 520 E-N RAMP

Over: 115th AVE NE & TRAIL

JCT I-405, King, WA

Built 1993 Load: 29.9 t ADT: 12,263

SW SPOKANE ST

Over: DELRIDGE WAY SW

1200 SW Spokane St, King, WA

Built 1983 Load: 29.9 t ADT: 93,180

FLAMING GEYSER RD

Over: BEAVER CREEK

FLAMING GEYSER STATE PARK, King, WA

Built 2017 Load: 30.1 t ADT: 200

I-5 EXPRESS LANES

Over: JAMES & CHERRY STREETS

0.8 N JCT I-90, King, WA

Built 1964 Load: 30.5 t ADT: 18,166

SR 203

Over: SLOUGH

0.8 N JCT SR 202, King, WA

Built 1945 Load: 30.8 t ADT: 7,622

SR 203

Over: SLOUGH

1.3 N JCT SR 202, King, WA

Built 1945 Load: 30.8 t ADT: 7,622

SR 203

Over: SLOUGH

2.1 N JCT SR 202, King, WA

Built 1945 Load: 30.8 t ADT: 7,622

I-90

Over: E FK ISSAQUAH CR

5.6 E JCT SR 900, King, WA

Built 1951 Load: 30.8 t ADT: 32,820

SR 18

Over: GREEN RIVER

2.5 E JCT SR 164, King, WA

Built 1959 Load: 30.8 t ADT: 27,460

I-5

Over: RAVENNA BLVD

2.3 N JCT SR 520, King, WA

Built 1961 Load: 30.8 t ADT: 88,792

I-5 S-W RAMP

Over: TERRAIN

5.6 N JCT SR 900, King, WA

Built 1967 Load: 30.8 t ADT: 19,202

SR 520

Over: 130TH AVE NE

1.0 E JCT I-405, King, WA

Built 1970 Load: 30.8 t ADT: 43,146

SR 167

Over: ELLINGSON ROAD

1.1 N PIERCE CO, King, WA

Built 1977 Load: 30.8 t ADT: 92,898

OVERPASS TO T-5

Over: W. MARGINAL WY S.W.

0.9 MI. W. OF SR 99, King, WA

Built 1997 Load: 30.8 t ADT: 1,000

3RD ST SW

Over: SOUND TRANSIT P&R ACCESS

0.3 MILES WEST OF SR 18, King, WA

Built 2002 Load: 30.8 t ADT: 3,200

ROAD

Over: DINGFORD CREEK

5.8 MI E OF 56/5640 JCT, King, WA

Built 1961 Load: 30.9 t ADT: 45

W.B. I-90

Over: LAKE WASHINGTON

3.0 E JCT I-5, King, WA

Built 1989 Load: 31.1 t ADT: 63,053

NORTHUP WAY

Over: EASTSIDE RAIL CORRIDOR

NORTHUP & 116TH, King, WA

Built 1987 Load: 31.1 t ADT: 14,250

COAL CREEK PARKWAY

Over: COAL CREEK

1.3 MI E OF SR-405, King, WA

Built 2014 Load: 31.4 t ADT: 31,258

SR 203

Over: SLOUGH

0.7 N JCT SR 202, King, WA

Built 1945 Load: 31.7 t ADT: 7,622

I-5

Over: RAVENNA BLVD

2.3 N JCT SR 520, King, WA

Built 1961 Load: 31.7 t ADT: 88,792

SR 167

Over: 84TH AVE SOUTH

1.7 N JCT SR 516, King, WA

Built 1967 Load: 31.7 t ADT: 52,291

SR 202

Over: SNOQUALMIE RIVER

14.0 E JCT SR 520, King, WA

Built 1980 Load: 31.7 t ADT: 12,373

I-90 RAMP

Over: E FK ISSAQUAH CREEK

2.4 E JCT SR 900, King, WA

Built 1976 Load: 31.8 t ADT: 3,818

N.W.SAMMAMISH ROAD

Over: ISSAQUAH CREEK

0.2 MI W OF E LK SAMM PKW, King, WA

Built 1996 Load: 31.8 t ADT: 44,000

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