US Bridges

Brinn Road over Milton Creek

Fair

Columbia County, Oregon · 035 MI W ST Helens · Structure no. 13695A101900010

Built
1925
100 years old, rebuilt 1975
Condition
Fair
inspected May 2023
Type
Slab
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
340
2020 count
Owner
County
County Highway Agency

About this bridge

Brinn Road over Milton Creek is a prestressed concrete slab carrying Brinn Road over Milton Creek in Columbia County, Oregon. It was built in 1925 and reconstructed in 1975, so it is 100 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.

It carries about 340 vehicles a day, roughly 10% of them trucks, projected to reach 385 by 2025. The structure is 40 ft (12.2 m) long and 20 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesBrinn Road
CrossesMilton Creek
Location035 MI W ST Helens
RouteCounty Highway C1019
CountyColumbia County
StateOregon
Coordinates45.86651, -122.89011
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating62.8 US tons
Inventory rating48.6 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic340 (2020)
Projected traffic385 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$205,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Brinn Road over Milton Creek built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1975.

What condition is Brinn Road over Milton 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 May 2023.

How much traffic does Brinn Road over Milton Creek carry?

About 340 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Brinn Road over Milton Creek?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 20 ft wide.

Who owns Brinn Road over Milton Creek?

It is owned by the County Highway Agency.