US Bridges

County RD 38 over Olalla Creek

Good

Douglas County, Oregon · 7.5 MI S of Porter Creek · Structure no. 17954 003800648

Built
1998
27 years old
Condition
Good
inspected July 2023
Type
Slab
Prestressed Concrete
Length
172 ft
3 main spans
Daily traffic
639
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 38 over Olalla Creek is a prestressed concrete slab carrying County RD 38 over Olalla Creek in Douglas County, Oregon. It was built in 1998, so it is 27 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 639 vehicles a day, roughly 10% of them trucks, projected to reach 724 by 2025. The structure is 172 ft (52.4 m) long and 36 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCounty RD 38
CrossesOlalla Creek
Location7.5 MI S of Porter Creek
RouteCounty Highway C0038
CountyDouglas County
StateOregon
Coordinates43.04433, -123.54235
Functional classRural Minor Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating39.7 US tons
Inventory rating30.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length172 ft (52.4 m)
Longest span66 ft (20.1 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic639 (2020)
Projected traffic724 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 County RD 38 over Olalla Creek built?

It was built in 1998, making it 27 years old in 2025.

What condition is County RD 38 over Olalla 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 2023.

How much traffic does County RD 38 over Olalla Creek carry?

About 639 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is County RD 38 over Olalla Creek?

The structure is 172 ft (52.4 m) long with a longest span of 66 ft (20.1 m) and a deck 36 ft wide.

Who owns County RD 38 over Olalla Creek?

It is owned by the County Highway Agency.