US Bridges

Boston Street over Deschutes River

Fair

Thurston County, Washington · 00.10 S. Custer Way · Structure no. 085452000000000

Built
1915
110 years old
Condition
Fair
inspected September 2023
Type
Other
Concrete Continuous
Length
190 ft
4 main spans
Daily traffic
7,400
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Boston Street over Deschutes River is a concrete continuous other carrying Boston Street over Deschutes River in Thurston County, Washington. It was built in 1915, so it is 110 years old, older than the Washington average of 49.8 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 7,400 vehicles a day, roughly 5% of them trucks, projected to reach 6,200 by 2038. The structure is 190 ft (57.9 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesBoston Street
CrossesDeschutes River
Location00.10 S. Custer Way
RouteCity Street 25
Coordinates47.01564, -122.90486
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating74 US tons
Inventory rating44 US tons

Structure

Structure typeOther
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadH 15
Structure length190 ft (57.9 m)
Longest span75 ft (22.9 m)
Deck width30 ft (9.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,400 (2018)
Projected traffic6,200 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Boston Street over Deschutes River built?

It was built in 1915, making it 110 years old in 2025.

What condition is Boston Street over Deschutes River 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 September 2023.

How much traffic does Boston Street over Deschutes River carry?

About 7,400 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Boston Street over Deschutes River?

The structure is 190 ft (57.9 m) long with a longest span of 75 ft (22.9 m) and a deck 30 ft wide.

Who owns Boston Street over Deschutes River?

It is owned by the City or Municipal Highway Agency.