US Bridges

Pittsburg Road over Milton Creek

Fair

Columbia County, Oregon · 025 MI NW of Yankton · Structure no. 13692A112800396

Built
1976
49 years old
Condition
Fair
inspected May 2023
Type
Slab
Prestressed Concrete
Length
48 ft
1 main span
Daily traffic
1,058
2020 count
Owner
County
County Highway Agency

About this bridge

Pittsburg Road over Milton Creek is a prestressed concrete slab carrying Pittsburg Road over Milton Creek in Columbia County, Oregon. It was built in 1976, so it is 49 years old, younger 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 1,058 vehicles a day, roughly 10% of them trucks, projected to reach 1,198 by 2025. The structure is 48 ft (14.6 m) long and 36 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

Location

Open in Google Maps
CarriesPittsburg Road
CrossesMilton Creek
Location025 MI NW of Yankton
RouteCounty Highway C1128
CountyColumbia County
StateOregon
Coordinates45.89338, -122.92757
Functional classRural Minor Collector

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
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length48 ft (14.6 m)
Longest span47 ft (14.3 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,058 (2020)
Projected traffic1,198 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 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 Pittsburg Road over Milton Creek built?

It was built in 1976, making it 49 years old in 2025.

What condition is Pittsburg 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 Pittsburg Road over Milton Creek carry?

About 1,058 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Pittsburg Road over Milton Creek?

The structure is 48 ft (14.6 m) long with a longest span of 47 ft (14.3 m) and a deck 36 ft wide.

Who owns Pittsburg Road over Milton Creek?

It is owned by the County Highway Agency.