US Bridges

Collins Road over Brunswick Creek

Good

Washington County, Oregon · 024 MI NW Shadybrook · Structure no. 671425010001450

Built
1997
28 years old
Condition
Good
inspected August 2024
Type
Slab
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
231
2020 count
Owner
County
County Highway Agency

About this bridge

Collins Road over Brunswick Creek is a prestressed concrete slab carrying Collins Road over Brunswick Creek in Washington County, Oregon. It was built in 1997, so it is 28 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 231 vehicles a day, roughly 1% of them trucks, projected to reach 261 by 2025. The structure is 50 ft (15.2 m) long and 16 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

CarriesCollins Road
CrossesBrunswick Creek
Location024 MI NW Shadybrook
RouteCounty Highway C0100
StateOregon
Coordinates45.66163, -122.98976
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56.8 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length50 ft (15.2 m)
Longest span49 ft (14.9 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic231 (2020)
Projected traffic261 by 2025
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$256,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Collins Road over Brunswick Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is Collins Road over Brunswick 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 August 2024.

How much traffic does Collins Road over Brunswick Creek carry?

About 231 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Collins Road over Brunswick Creek?

The structure is 50 ft (15.2 m) long with a longest span of 49 ft (14.9 m) and a deck 16 ft wide.

Who owns Collins Road over Brunswick Creek?

It is owned by the County Highway Agency.