US Bridges

12 Road SW over Royal Branch Canal Blk 8

FairPosted for load

Grant County, Washington · 12 SW .2 East of K · Structure no. 084404000000000

Built
1956
69 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
53 ft
2 main spans
Daily traffic
72
2021 count
Owner
County
County Highway Agency

About this bridge

12 Road SW over Royal Branch Canal Blk 8 is a wood or timber stringer/multi-beam or girder carrying 12 Road SW over Royal Branch Canal Blk 8 in Grant County, Washington. It was built in 1956, so it is 69 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 72 vehicles a day, roughly 45% of them trucks, projected to reach 176 by 2043. The structure is 53 ft (16.2 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries12 Road SW
CrossesRoyal Branch Canal Blk 8
Location12 SW .2 East of K
RouteCounty Highway 10270
CountyGrant County
StateWashington
Coordinates46.9139, -119.72304
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length53 ft (16.2 m)
Longest span25 ft (7.6 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic72 (2021)
Projected traffic176 by 2043
Trucks45%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 12 Road SW over Royal Branch Canal Blk 8 built?

It was built in 1956, making it 69 years old in 2025.

What condition is 12 Road SW over Royal Branch Canal Blk 8 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.

How much traffic does 12 Road SW over Royal Branch Canal Blk 8 carry?

About 72 vehicles per day (2021 count), of which roughly 45% are trucks.

How long is 12 Road SW over Royal Branch Canal Blk 8?

The structure is 53 ft (16.2 m) long with a longest span of 25 ft (7.6 m) and a deck 25 ft wide.

Who owns 12 Road SW over Royal Branch Canal Blk 8?

It is owned by the County Highway Agency.