US Bridges

Miller RD over Rock Creek

FairPosted for load

Clackamas County, Oregon · 00.5 MI W of Barlow Road · Structure no. 06113 000

Built
1960
65 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete
Length
176 ft
7 main spans
Daily traffic
151
2020 count
Owner
County
County Highway Agency

About this bridge

Miller RD over Rock Creek is a concrete tee beam carrying Miller RD over Rock Creek in Clackamas County, Oregon. It was built in 1960, so it is 65 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 151 vehicles a day, roughly 8% of them trucks, projected to reach 167 by 2025. The structure is 176 ft (53.6 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesMiller RD
CrossesRock Creek
Location00.5 MI W of Barlow Road
RouteCounty Highway C0435
StateOregon
Coordinates45.16541, -122.73496
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.7 US tons
Inventory rating24.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadH 20
Structure length176 ft (53.6 m)
Longest span24 ft (7.3 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic151 (2020)
Projected traffic167 by 2025
Trucks8%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Miller RD over Rock Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Miller RD 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 April 2023.

How much traffic does Miller RD over Rock Creek carry?

About 151 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Miller RD over Rock Creek?

The structure is 176 ft (53.6 m) long with a longest span of 24 ft (7.3 m) and a deck 28 ft wide.

Who owns Miller RD over Rock Creek?

It is owned by the County Highway Agency.