US Bridges

Gibson Road SW over Scatter Creek

Fair

Thurston County, Washington · 0.14 Mile North of HWY 99 · Structure no. 084306000000000

Built
1967
58 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
62 ft
1 main span
Daily traffic
535
2024 count
Owner
County
County Highway Agency

About this bridge

Gibson Road SW over Scatter Creek is a steel stringer/multi-beam or girder carrying Gibson Road SW over Scatter Creek in Thurston County, Washington. It was built in 1967, so it is 58 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 535 vehicles a day, roughly 15% of them trucks, projected to reach 827 by 2041. The structure is 62 ft (18.9 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesGibson Road SW
CrossesScatter Creek
Location0.14 Mile North of HWY 99
RouteCounty Highway 11770
CountyThurston County
StateWashington
Coordinates46.82498, -122.96064
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating97 US tons
Inventory rating58 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span30 ft (9.1 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic535 (2024)
Projected traffic827 by 2041
Trucks15%
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 proposedDeck replacement with only incidental widening
Estimated improvement cost$854,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Gibson Road SW over Scatter Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is Gibson Road SW over Scatter Creek 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 August 2024.

How much traffic does Gibson Road SW over Scatter Creek carry?

About 535 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is Gibson Road SW over Scatter Creek?

The structure is 62 ft (18.9 m) long with a longest span of 30 ft (9.1 m) and a deck 26 ft wide.

Who owns Gibson Road SW over Scatter Creek?

It is owned by the County Highway Agency.