US Bridges

Wildcat RD over Marquam Creek

FairPosted for load

Clackamas County, Oregon · 00.3 MI E of Marquam · Structure no. 06175 000 00030

Built
1966
59 years old
Condition
Fair
inspected September 2024
Type
Slab
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
216
2020 count
Owner
County
County Highway Agency

About this bridge

Wildcat RD over Marquam Creek is a prestressed concrete slab carrying Wildcat RD over Marquam Creek in Clackamas County, Oregon. It was built in 1966, so it is 59 years old, older than the Oregon average of 49.9 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. Its operating status is: posted for load restriction.

It carries about 216 vehicles a day, roughly 21% of them trucks, projected to reach 221 by 2025. The structure is 24 ft (7.3 m) long and 27 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

CarriesWildcat RD
CrossesMarquam Creek
Location00.3 MI E of Marquam
RouteCounty Highway C0548
StateOregon
Coordinates45.07277, -122.67906
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating20 US tons
Inventory rating15.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadH 20
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width27 ft (8.2 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic216 (2020)
Projected traffic221 by 2025
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed4.3 mi (7 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Wildcat RD over Marquam Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is Wildcat RD over Marquam 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 September 2024.

How much traffic does Wildcat RD over Marquam Creek carry?

About 216 vehicles per day (2020 count), of which roughly 21% are trucks.

How long is Wildcat RD over Marquam Creek?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 27 ft wide.

Who owns Wildcat RD over Marquam Creek?

It is owned by the County Highway Agency.