Mason County, WA

139 public highway bridges

Mason County Bridge Snapshot

Mason County, Washington contains 139 public highway bridges in the FHWA National Bridge Inventory. Roughly 49.6% are rated “Good,” 38.8% “Fair,” 3.6% “Poor,” and 3.6% 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.

139
Total Bridges
49.6%
Good
3.6%
Poor
3.6%
Structurally Deficient

Condition Distribution

Good
49.6% (69)
Fair
38.8% (54)
Poor
3.6% (5)
SD
3.6% (5)

All Bridges (139)

NO DATA ENTERED

Good

Over: UPPER CANYON RIVER

NO DATA ENTERED, Mason, WA

Built 1955 Load: 38.5 t ADT: 15

SR 106

Good

Over: TWANOH FALLS CREEK

13.5 E JCT US 101, Mason, WA

Built 2014 Load: 38.9 t ADT: 2,309

NO DATA ENTERED

Good

Over: HAMMA HAMMA RIVER

NO DATA ENTERED, Mason, WA

Built 1968 Load: 39.0 t ADT: 25

Elfendahl Pass Rd

Good

Over: Stimson Creek

0.17 N JCT N. Shore rd, Mason, WA

Built 2013 Load: 39.5 t ADT: 65

Mason Lake Rd.

Good

Over: CRANBERRY CREEK

2.68 N JCT SR 3, Mason, WA

Built 1993 Load: 39.9 t ADT: 1,783

Eich Road

Good

Over: Little Skookum Creek

0.15 N Jct SR 108, Mason, WA

Built 2004 Load: 39.9 t ADT: 22

Old Oly. Highway

Good

Over: SKOOKUM CREEK

0.43 S JCT SR101, Mason, WA

Built 2006 Load: 39.9 t ADT: 72

Finch Creek Rd

Good

Over: FINCH CREEK

0.18 Miles W SR 101, Mason, WA

Built 2009 Load: 39.9 t ADT: 184

US 101

Good

Over: PURDY CREEK

4.1 S JCT SR 106, Mason, WA

Built 2009 Load: 40.8 t ADT: 7,382

IRR BIA RTE 8

Good

Over: SKOBOB CREEK

SKOKOMISH TRIBAL CENTER, Mason, WA

Built 1998 Load: 42.1 t ADT: 525

Cloquallum Road

Good

Over: CLOQUALLUM CREEK

1.53 S JCT Highland rd, Mason, WA

Built 1996 Load: 42.6 t ADT: 627

SR 108

Good

Over: LITTLE SKOOKUM CREEK

7.7 E GRAYS HBR CO, Mason, WA

Built 2016 Load: 42.8 t ADT: 11,436

N. Shore Road

Good

Over: Cady Creek

3.55 W JCT SR300, Mason, WA

Built 2022 Load: 42.8 t ADT: 513

SKOK. RIVER RD

Good

Over: WEAVER CREEK

0.69 W JCT SR101, Mason, WA

Built 2012 Load: 43.7 t ADT: 494

North Shore Road

Good

Over: Great Bend Creek

13.3 M JCT SR 300, Mason, WA

Built 2022 Load: 43.7 t ADT: 513

SR 106

Good

Over: SKOBOB CREEK

0.8 E JCT US 101, Mason, WA

Built 2005 Load: 44.4 t ADT: 1,584

Homer Adams Road

Good

Over: Deckerville Creek

0.15 mi. S Deckerville rd, Mason, WA

Built 2021 Load: 45.0 t ADT: 50

Shelton Matlock Rd

Good

Over: GOLDSBOROUGH CREEK

1.38 W JCT SR 3, Mason, WA

Built 1977 Load: 45.4 t ADT: 8,200

VANCE CR LOOP

Good

Over: FIR CREEK

NFSR 23 TO NFSR 2230, Mason, WA

Built 2010 Load: 46.0 t ADT: 10

SR 106

Good

Over: SKOKOMISH RIVER

1.4 E JCT US 101, Mason, WA

Built 1987 Load: 46.3 t ADT: 1,584

AGATE RD

Good

Over: CAMPBELL CREEK

3.13 S JCT SR3, Mason, WA

Built 1993 Load: 46.3 t ADT: 3,036

BELFAIR TAHUYA RD

Good

Over: TAHUYA RIVER

3.73 NW N. SHORE RD, Mason, WA

Built 2009 Load: 47.0 t ADT: 2,558

US 101

Good

Over: SLOUGH

1.6 S JCT SR 106, Mason, WA

Built 1985 Load: 47.2 t ADT: 7,382

NO DATA ENTERED

Good

Over: CABIN CREEK

NO DATA ENTERED, Mason, WA

Built 1993 Load: 49.0 t ADT: 75

Cloquallum Road

Good

Over: CLOQUALLUM CREEK

2.31 S JCT Highland Rd, Mason, WA

Built 1996 Load: 49.0 t ADT: 627

Grapeview Loop Rd

Good

Over: MCLANE COVE

2.45 E JCT SR 3, Mason, WA

Built 2008 Load: 51.7 t ADT: 835

Bolling Road

Good

Over: Gosnell Creek

0.23 S JCT Cloquallum rd, Mason, WA

Built 2003 Load: 55.3 t ADT: 36

Cloquallum Road

Good

Over: CLOQUALLUM CREEK

2.51 MI S JCT Satsop Cloq, Mason, WA

Built 1994 Load: 58.0 t ADT: 627

NO DATA ENTERED

Good

Over: WAKETICKEH CREEK

NO DATA ENTERED, Mason, WA

Built 2000 Load: 58.1 t ADT: 75

NO DATA ENTERED

Good

Over: JEFFERSON CREEK

NO DATA ENTERED, Mason, WA

Built 1986 Load: 59.9 t ADT: 10

NO DATA ENTERED

Good

Over: QUITTER CREEK

NO DATA ENTERED, Mason, WA

Built 1959 Load: 64.8 t ADT: 50

Plug Mill Road

Good

Over: DRY RUN CREEK

0.05 N Satsop/Cloquallum, Mason, WA

Built 1994 Load: 65.3 t ADT: 37

SR 106

Good

Over: ALDERBROOK PED PATH

7.0 E JCT US 101, Mason, WA

Built 2007 Load: 89.8 t ADT: 2,309

SatsopCloquallumRD

Good

Over: COMFORT CREEK

6.32 W of Cloquallum Rd, Mason, WA

Built 2000 Load: 89.8 t ADT: 132

Little Egypt Rd.

Poor

Over: NO. FK. GOLDSBOROUGH CK.

0.33 S JCT SHELTONMATLOC, Mason, WA

Built 1958 Load: 20.0 t ADT: 191

NO DATA ENTERED

Poor

Over: LENA CREEK

NO DATA ENTERED, Mason, WA

Built 1964 Load: 25.4 t ADT: 25

W. Bulb Farm Rd.

Poor

Over: CLOQUALLUM CREEK

0.35 S JCT Cloquallum rd, Mason, WA

Built 1961 Load: 32.7 t ADT: 62

BEAR CK / DEWATTO

Poor

Over: TAHUYA RIVER

5.3 MILES WEST OBH, Mason, WA

Built 1995 Load: 39.9 t ADT: 1,050

Harstine Bridge Rd

Structurally Deficient

Over: PICKERING PASSAGE

3.4 E JCT SR3, Mason, WA

Built 1969 Load: 15.4 t ADT: 2,155

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