US Bridges

Porter RD over Delph/Creek

Good

Clackamas County, Oregon · 0.6 MI JCT Porter/Tumala · Structure no. 21651 000 00260

Built
2010
15 years old
Condition
Good
inspected July 2024
Type
Slab
Prestressed Concrete
Length
39 ft
1 main span
Daily traffic
408
2020 count
Owner
County
County Highway Agency

About this bridge

Porter RD over Delph/Creek is a prestressed concrete slab carrying Porter RD over Delph/Creek in Clackamas County, Oregon. It was built in 2010, so it is 15 years old, younger than the Oregon average of 49.9 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 408 vehicles a day, roughly 12% of them trucks, projected to reach 437 by 2025. The structure is 39 ft (12 m) long and 25 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

CarriesPorter RD
CrossesDelph/Creek
Location0.6 MI JCT Porter/Tumala
RouteCounty Highway C0339
StateOregon
Coordinates45.25856, -122.21097
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.6 US tons
Inventory rating37.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length39 ft (12 m)
Longest span36 ft (11.1 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic408 (2020)
Projected traffic437 by 2025
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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 Porter RD over Delph/Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is Porter RD over Delph/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 July 2024.

How much traffic does Porter RD over Delph/Creek carry?

About 408 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is Porter RD over Delph/Creek?

The structure is 39 ft (12 m) long with a longest span of 36 ft (11.1 m) and a deck 25 ft wide.

Who owns Porter RD over Delph/Creek?

It is owned by the County Highway Agency.