US Bridges

RTE 109 over RTE 908M

Fair

Suffolk County, New York · JCT Rts 109+SSP · Structure no. 000000001036929

Built
1940
85 years old
Condition
Fair
inspected November 2023
Type
Arch - Deck
Concrete
Length
69 ft
1 main span
Daily traffic
41,412
2020 count
Owner
State
State Highway Agency

About this bridge

RTE 109 over RTE 908M is a concrete arch - deck carrying RTE 109 over RTE 908M in Suffolk County, New York. It was built in 1940, so it is 85 years old, older than the New York average of 53 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 41,412 vehicles a day, roughly 9% of them trucks, projected to reach 47,781 by 2041. The structure is 69 ft (21 m) long and 91 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesRTE 109
CrossesRTE 908M
LocationJCT Rts 109+SSP
RouteState Highway 109
Coordinates40.71807, -73.40792
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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating75.9 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length69 ft (21 m)
Longest span63 ft (19.2 m)
Deck width91 ft (27.7 m)
Roadway width74 ft (22.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,412 (2020)
Projected traffic47,781 by 2041
Trucks9%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$9.3 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was RTE 109 over RTE 908M built?

It was built in 1940, making it 85 years old in 2025.

What condition is RTE 109 over RTE 908M 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 November 2023.

How much traffic does RTE 109 over RTE 908M carry?

About 41,412 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is RTE 109 over RTE 908M?

The structure is 69 ft (21 m) long with a longest span of 63 ft (19.2 m) and a deck 91 ft wide.

Who owns RTE 109 over RTE 908M?

It is owned by the State Highway Agency.