US Bridges

South Bank Road over Unnamed Creek

Good

Grays Harbor County, Washington · 1.9 NW JCT SR 12 · Structure no. 087522000000000

Built
2006
19 years old
Condition
Good
inspected January 2023
Type
Culvert
Steel
Length
26 ft
1 main span
Daily traffic
1,119
2022 count
Owner
County
County Highway Agency

About this bridge

South Bank Road over Unnamed Creek is a steel culvert carrying South Bank Road over Unnamed Creek in Grays Harbor County, Washington. It was built in 2006, so it is 19 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,119 vehicles a day, roughly 5% of them trucks, projected to reach 1,660 by 2042. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 14.3 mi (23 km).

CarriesSouth Bank Road
CrossesUnnamed Creek
Location1.9 NW JCT SR 12
RouteCounty Highway 96411
Coordinates46.94308, -123.35075
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHL 93
Structure length26 ft (7.9 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,119 (2022)
Projected traffic1,660 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was South Bank Road over Unnamed Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is South Bank Road over Unnamed Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2023.

How much traffic does South Bank Road over Unnamed Creek carry?

About 1,119 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is South Bank Road over Unnamed Creek?

The structure is 26 ft (7.9 m) long with a longest span of 20 ft (6.1 m).

Who owns South Bank Road over Unnamed Creek?

It is owned by the County Highway Agency.