US Bridges

Amboy Road over Cedar Creek

Good

Clark County, Washington · 0.5 M. N of Yacolt Road · Structure no. 087092000000000

Built
1999
26 years old
Condition
Good
inspected February 2023
Type
Culvert
Steel
Length
35 ft
1 main span
Daily traffic
1,483
2017 count
Owner
County
County Highway Agency

About this bridge

Amboy Road over Cedar Creek is a steel culvert carrying Amboy Road over Cedar Creek in Clark County, Washington. It was built in 1999, so it is 26 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 1,483 vehicles a day, roughly 5% of them trucks, projected to reach 3,669 by 2039. The structure is 35 ft (10.7 m) long and 24 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesAmboy Road
CrossesCedar Creek
Location0.5 M. N of Yacolt Road
RouteCounty Highway 96200
Coordinates45.87318, -122.40927
Functional classRural Minor 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 inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating44.3 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadH 20
Structure length35 ft (10.7 m)
Longest span35 ft (10.7 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,483 (2017)
Projected traffic3,669 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Amboy Road over Cedar Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is Amboy Road over Cedar 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 February 2023.

How much traffic does Amboy Road over Cedar Creek carry?

About 1,483 vehicles per day (2017 count), of which roughly 5% are trucks.

How long is Amboy Road over Cedar Creek?

The structure is 35 ft (10.7 m) long with a longest span of 35 ft (10.7 m) and a deck 24 ft wide.

Who owns Amboy Road over Cedar Creek?

It is owned by the County Highway Agency.