US Bridges

Old Portland Road over Milton Creek

Fair

Columbia County, Oregon · 004 MI N FAU 6220 · Structure no. 01520 111900280

Built
1930
95 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete
Length
53 ft
1 main span
Daily traffic
2,596
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Old Portland Road over Milton Creek is a concrete tee beam carrying Old Portland Road over Milton Creek in Columbia County, Oregon. It was built in 1930, so it is 95 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 2,596 vehicles a day, roughly 10% of them trucks, projected to reach 2,863 by 2025. The structure is 53 ft (16.2 m) long and 28 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesOld Portland Road
CrossesMilton Creek
Location004 MI N FAU 6220
RouteCounty Highway A0747
CountyColumbia County
StateOregon
Coordinates45.85038, -122.81469
Functional classUrban Minor Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length53 ft (16.2 m)
Longest span52 ft (15.8 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,596 (2020)
Projected traffic2,863 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$272,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Portland Road over Milton Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is Old Portland 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 Old Portland Road over Milton Creek carry?

About 2,596 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Old Portland Road over Milton Creek?

The structure is 53 ft (16.2 m) long with a longest span of 52 ft (15.8 m) and a deck 28 ft wide.

Who owns Old Portland Road over Milton Creek?

It is owned by the City or Municipal Highway Agency.