Mason County, WA

139 public highway bridges

Mason County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Mason County, Washington contains 139 public highway bridges. Roughly 49.6% are rated “Good,” 38.8% “Fair,” and 3.6% “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.

139
Total Bridges
49.6%
Good
38.8%
Fair
3.6%
Poor Condition

Condition Distribution

Good
49.6% (69)
Fair
38.8% (54)
Poor
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

Harstine Bridge Rd

Poor

Over: PICKERING PASSAGE

3.4 E JCT SR3, Mason, WA

Built 1969 Load: 15.4 t ADT: 2,155

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

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

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

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.