US Bridges

Barlow RD over Rock Creek

Poor

Clackamas County, Oregon · 070 MI E HWY 99E · Structure no. 06023 027 00678

Built
1957
68 years old
Condition
Poor
inspected September 2024
Type
Tee Beam
Concrete
Length
275 ft
11 main spans
Daily traffic
1,100
2018 count
Owner
County
County Highway Agency

About this bridge

Barlow RD over Rock Creek is a concrete tee beam carrying Barlow RD over Rock Creek in Clackamas County, Oregon. It was built in 1957, so it is 68 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,100 vehicles a day, roughly 23% of them trucks, projected to reach 1,200 by 2038. The structure is 275 ft (83.8 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesBarlow RD
CrossesRock Creek
Location070 MI E HWY 99E
RouteCounty Highway 0A595
CountyClackamas County
StateOregon
Coordinates45.1519, -122.72377
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52.9 US tons
Inventory rating40.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans11
Design loadUnknown
Structure length275 ft (83.8 m)
Longest span25 ft (7.6 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2018)
Projected traffic1,200 by 2038
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.4 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Barlow RD over Rock Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is Barlow RD over Rock Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does Barlow RD over Rock Creek carry?

About 1,100 vehicles per day (2018 count), of which roughly 23% are trucks.

How long is Barlow RD over Rock Creek?

The structure is 275 ft (83.8 m) long with a longest span of 25 ft (7.6 m) and a deck 31 ft wide.

Who owns Barlow RD over Rock Creek?

It is owned by the County Highway Agency.