US Bridges

Boston Mill RD over Butte Creek

Fair

Linn County, Oregon · 010 MI North Saddlebutte · Structure no. 12285A001300851

Built
1998
27 years old
Condition
Fair
inspected October 2024
Type
Slab
Prestressed Concrete
Length
120 ft
3 main spans
Daily traffic
340
2021 count
Owner
County
County Highway Agency

About this bridge

Boston Mill RD over Butte Creek is a prestressed concrete slab carrying Boston Mill RD over Butte Creek in Linn 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 fair condition with a lowest component rating of 5 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 15% of them trucks, projected to reach 464 by 2041. The structure is 120 ft (36.6 m) long and 32 ft wide. If it were closed, the detour would be 10.6 mi (17 km).

Location

Open in Google Maps
CarriesBoston Mill RD
CrossesButte Creek
Location010 MI North Saddlebutte
RouteCounty Highway A0477
CountyLinn County
StateOregon
Coordinates44.47209, -123.0594
Functional classRural Major 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
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 typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span40 ft (12.2 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic340 (2021)
Projected traffic464 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed10.6 mi (17 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 Boston Mill RD over Butte Creek built?

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

What condition is Boston Mill RD over Butte 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 October 2024.

How much traffic does Boston Mill RD over Butte Creek carry?

About 340 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is Boston Mill RD over Butte Creek?

The structure is 120 ft (36.6 m) long with a longest span of 40 ft (12.2 m) and a deck 32 ft wide.

Who owns Boston Mill RD over Butte Creek?

It is owned by the County Highway Agency.