King County, WA

1,364 public highway bridges

King County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, King County, Washington contains 1,364 public highway bridges. Roughly 31% are rated “Good,” 33.4% “Fair,” and 3.3% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

1,364

Total Bridges

31%

Good

33.4%

Fair

3.3%

Poor Condition

Condition Distribution

Good

31% (423)

Fair

33.4% (456)

Poor

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.

Related

Browse all → | Rankings →

Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

P

Compiled by PlainBridges, Independent data publisher

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.