US Bridges

SR 513 over Montlake Cut

FairPosted for load

King County, Washington · 0.2 N JCT SR 520 · Structure no. 000000HH0000000

Built
1924
101 years old, rebuilt 2021
Condition
Fair
inspected April 2024
Type
Movable - Bascule
Steel
Length
344 ft
1 main span
Daily traffic
55,497
2023 count
Owner
State
State Highway Agency

About this bridge

SR 513 over Montlake Cut is a steel movable - bascule carrying SR 513 over Montlake Cut in King County, Washington. It was built in 1924 and reconstructed in 2021, so it is 101 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 55,497 vehicles a day, roughly 3% of them trucks, projected to reach 92,762 by 2039. The structure is 344 ft (104.9 m) long and 60 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR 513
CrossesMontlake Cut
Location0.2 N JCT SR 520
RouteState Highway 513
CountyKing County
StateWashington
Coordinates47.64692, -122.30461
Functional classUrban Other Principal 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 rating33 US tons
Inventory rating20 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckOpen grating
Main spans1 (+6 approach)
Design loadUnknown
Structure length344 ft (104.9 m)
Longest span156 ft (47.5 m)
Deck width60 ft (18.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic55,497 (2023)
Projected traffic92,762 by 2039
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$15.5 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR 513 over Montlake Cut built?

It was built in 1924, making it 101 years old in 2025. It was reconstructed in 2021.

What condition is SR 513 over Montlake Cut 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 April 2024.

How much traffic does SR 513 over Montlake Cut carry?

About 55,497 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is SR 513 over Montlake Cut?

The structure is 344 ft (104.9 m) long with a longest span of 156 ft (47.5 m) and a deck 60 ft wide.

Who owns SR 513 over Montlake Cut?

It is owned by the State Highway Agency.