US Bridges

Troge Road (w) over Rock Creek

Fair

Clackamas County, Oregon · 00.66 MI W of Foster RD · Structure no. 06618 000 00066

Built
1968
57 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
29 ft
1 main span
Daily traffic
387
2020 count
Owner
County
County Highway Agency

About this bridge

Troge Road (w) over Rock Creek is a prestressed concrete slab carrying Troge Road (w) over Rock Creek in Clackamas County, Oregon. It was built in 1968, so it is 57 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.

It carries about 387 vehicles a day, roughly 10% of them trucks, projected to reach 415 by 2025. The structure is 29 ft (8.8 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesTroge Road (w)
CrossesRock Creek
Location00.66 MI W of Foster RD
RouteCounty Highway C1631
CountyClackamas County
StateOregon
Coordinates45.4358, -122.48539
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating32.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span27 ft (8.2 m)
Deck width28 ft (8.4 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic387 (2020)
Projected traffic415 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Troge Road (w) over Rock Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is Troge Road (w) over Rock 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 July 2024.

How much traffic does Troge Road (w) over Rock Creek carry?

About 387 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Troge Road (w) over Rock Creek?

The structure is 29 ft (8.8 m) long with a longest span of 27 ft (8.2 m) and a deck 28 ft wide.

Who owns Troge Road (w) over Rock Creek?

It is owned by the County Highway Agency.