Grant County, WA

314 public highway bridges

Grant County Bridge Snapshot

Grant County, Washington contains 314 public highway bridges in the FHWA National Bridge Inventory. Roughly 60.5% are rated “Good,” 30.3% “Fair,” 1.6% “Poor,” and 1.6% 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.

314
Total Bridges
60.5%
Good
1.6%
Poor
1.6%
Structurally Deficient

Condition Distribution

Good
60.5% (190)
Fair
30.3% (95)
Poor
1.6% (5)
SD
1.6% (5)

All Bridges (314)

MAINTENANCE ROAD

Good

Over: ROCKY COULEE WASTEWAY

ROCKY COULEE WASTEWAY, Grant, WA

Built 1949 Load: 36.0 t ADT: 15

Wheeler Rd

Good

Over: East Low Canal

3 NE 0.1 East of O NE, Grant, WA

Built 2010 Load: 37.6 t ADT: 1,109

Vantage Rd

Good

Over: FRENCHMAN SPRINGS

Vantage Rd .9 W Silica, Grant, WA

Built 1931 Load: 37.9 t ADT: 169

SR 243

Good

Over: LOWER CRAB CR

19.6 N JCT SR 24, Grant, WA

Built 1970 Load: 38.1 t ADT: 5,987

Cannawai Valley Rd

Good

Over: Cannawai Creek

2.43 E of Wilson Creek, Grant, WA

Built 2007 Load: 38.6 t ADT: 15

Q - NW

Good

Over: IRRIGATION CANAL

Q NW .1 N of 11, Grant, WA

Built 2003 Load: 38.9 t ADT: 392

I-90

Good

Over: SILICA RD

6.1 E JCT SR 26, Grant, WA

Built 1981 Load: 39.0 t ADT: 7,785

I-90

Good

Over: SILICA RD

6.1 E JCT SR 26, Grant, WA

Built 1982 Load: 39.0 t ADT: 7,785

S NW

Good

Over: IRRIGATION CANAL

S NW .4 S of SR 28, Grant, WA

Built 2004 Load: 39.2 t ADT: 663

9-NW

Good

Over: W 22 CANAL

9 NW 0.2 East of A NW, Grant, WA

Built 2003 Load: 39.5 t ADT: 75

Sand Dunes Rd

Good

Over: Moses Lake

Sand Dunes .6 S of Camas, Grant, WA

Built 2015 Load: 39.5 t ADT: 412

I-90

Good

Over: ROAD O NE

3.4 E JCT SR 17, Grant, WA

Built 1965 Load: 40.8 t ADT: 6,163

I-90

Good

Over: ROAD O NE

3.4 E JCT SR 17, Grant, WA

Built 1965 Load: 40.8 t ADT: 6,163

SR 28

Good

Over: CRAB CREEK

15.9 E JCT SR 17, Grant, WA

Built 1988 Load: 40.8 t ADT: 580

US 2

Good

Over: SOUTH COULEE DAM

27.4 E JCT SR 172, Grant, WA

Built 1984 Load: 40.8 t ADT: 1,935

3 RD NW

Good

Over: WEST CANAL

3 NW 1 West of SR 281, Grant, WA

Built 2002 Load: 40.8 t ADT: 96

F ROAD NE

Good

Over: MAIN CANAL

F NE .43 mile N of 23, Grant, WA

Built 2008 Load: 41.5 t ADT: 18

SR 262

Good

Over: LAT. WG1J BLK 80

4.9 N JCT SR 26, Grant, WA

Built 1990 Load: 41.7 t ADT: 745

12 RD NE

Good

Over: EAST LOW CANAL

12 NE 2.2 E of J NE, Grant, WA

Built 2002 Load: 41.8 t ADT: 97

A-NW

Good

Over: W 22 CANAL

A NW 1.4 N of 9 NW, Grant, WA

Built 2003 Load: 41.8 t ADT: 467

Martin Road

Good

Over: Wasteway

Martin road at Adams, Grant, WA

Built 2017 Load: 42.8 t ADT: 188

SR 155

Good

Over: LOWER LEWIS CR

8.8 N JCT US 2, Grant, WA

Built 1949 Load: 43.5 t ADT: 959

MAINTENANCE ROAD

Good

Over: WEST CANAL

WEST CANAL LATERAL W26C,, Grant, WA

Built 1951 Load: 43.7 t ADT: 5

W-NE

Good

Over: BLACKROCK COULEE

W NE 0.2 S of 16, Grant, WA

Built 2003 Load: 43.7 t ADT: 235

HEADWORKS MAINTENA

Good

Over: CRAB CREEK SIPHON NO. 1

Crab Ck Siphon No. 1 Inle, Grant, WA

Built 1947 Load: 43.8 t ADT: 10

Canal Maintenance

Good

Over: East Low Canal - Crab Ck

Crab Ck Siphon No.1 Outle, Grant, WA

Built 1947 Load: 43.8 t ADT: 5

Canal Maintenance

Good

Over: East Low Canal - Brkn Rk

Broken Rock Siphon No.1 I, Grant, WA

Built 1947 Load: 43.8 t ADT: 2

Vantage Rd

Good

Over: FRENCHMAN SPRINGS

Vantage Rd 1.1 W Silica, Grant, WA

Built 1931 Load: 44.7 t ADT: 169

Adams road

Good

Over: Lateral. Block 73

Adams road at Martin, Grant, WA

Built 2017 Load: 45.0 t ADT: 247

SR 170

Good

Over: EAST LOW CANAL

2.4 E JCT SR 17, Grant, WA

Built 1980 Load: 46.3 t ADT: 2,802

WAHATIS PEAK ROAD

Good

Over: WAHLUKE BRANCH CANAL

NR MATTAWA, WA, Grant, WA

Built 1967 Load: 48.3 t ADT: 3

MAINTENANCE ROAD

Good

Over: WEST CANAL

Dry Coulee Siphon 2 Inlet, Grant, WA

Built 1946 Load: 50.7 t ADT: 5

Adams Rd

Good

Over: Lateral block 73

Adams at 11.5 NW, Grant, WA

Built 2017 Load: 52.8 t ADT: 589

11 N.W.

Good

Over: Wasteway

11 NW @ M NW, Grant, WA

Built 2017 Load: 53.8 t ADT: 232

S NE

Good

Over: Dry Coulee

S NE 1.0 S of 39 NE, Grant, WA

Built 2005 Load: 55.7 t ADT: 91

"39" Road NE

Good

Over: Field Runoff

39 NE .01 E of R NE, Grant, WA

Built 2010 Load: 56.1 t ADT: 49

US 2

Good

Over: DRY FALLS DAM

2.1 E DOUGLAS CO, Grant, WA

Built 1984 Load: 56.2 t ADT: 1,935

Maintenance Road

Good

Over: East Low Canal

Weber Branch Siphon, Grant, WA

Built 1950 Load: 56.8 t ADT: 1

East Low Canal

Good

Over: East Low Canal

Weber Coulee Siphon Outle, Grant, WA

Built 1950 Load: 56.8 t ADT: 1

Stratford Rd

Good

Over: Crab Creek

.25 S of Hwy 28, Grant, WA

Built 2017 Load: 59.6 t ADT: 778

MORGAN LAKE ROAD

Good

Over: POTHOLES CANAL

11.5 MI NNW OF OFFICE, Grant, WA

Built 2002 Load: 61.7 t ADT: 150

"R" Road NE

Good

Over: Field Runoff

R NE 0.5 North of 37, Grant, WA

Built 2010 Load: 64.5 t ADT: 156

BAIRD SPRINGS RD

Good

Over: Trinidad Creek

Baird Spring 1.7 N SR 28, Grant, WA

Built 2005 Load: 71.0 t ADT: 26

"R" Road NE

Good

Over: Field Runoff

R NE 0.1 North of 29 NE, Grant, WA

Built 2012 Load: 82.3 t ADT: 265

W-NE

Good

Over: NORTHUP CREEK

0.1S GR COULEE HILL RD, Grant, WA

Built 1985 Load: 88.8 t ADT: 56

SR 262

Good

Over: POTHOLES CANAL

17.5 N JCT SR 26, Grant, WA

Built 1949 Load: 89.8 t ADT: 1,559

Canal Maintenance

Good

Over: East Low Canal - Crab Ck

Crab Ck Siphon No.2 Inlet, Grant, WA

Built 1947 Load: 90.7 t ADT: 5

Canal Maintenance

Good

Over: East Low Canal - Crab Ck

Crab Ck Siphon No.2 Outle, Grant, WA

Built 1947 Load: 90.7 t ADT: 5

Canal Maintenance

Good

Over: East Low Canal - Brkn Rk

Broken Rock Siphon No.2 O, Grant, WA

Built 1947 Load: 90.7 t ADT: 1

MAINTENANCE ROAD

Good

Over: MAIN CANAL

MAIN CANAL 3.88, Grant, WA

Built 1977 Load: 91.5 t ADT: 10

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