US Bridges

Ri 108 Kngstown RD over Saugatucket River

FairPosted for load

Washington County, Rhode Island · 3.0 MI S of JCT Ri 138 · Structure no. 000000000001780

Built
1885
140 years old, rebuilt 1930
Condition
Fair
inspected August 2024
Type
Arch - Deck
Masonry
Length
24 ft
1 main span
Daily traffic
8,515
2021 count
Owner
State
State Highway Agency

About this bridge

Ri 108 Kngstown RD over Saugatucket River is a masonry arch - deck carrying Ri 108 Kngstown RD over Saugatucket River in Washington County, Rhode Island. It was built in 1885 and reconstructed in 1930, so it is 140 years old, older than the Rhode Island average of 54.5 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 8,515 vehicles a day, roughly 7% of them trucks, projected to reach 9,367 by 2041. The structure is 24 ft (7.3 m) long and 32 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesRi 108 Kngstown RD
CrossesSaugatucket River
Location3.0 MI S of JCT Ri 138
RouteState Highway 108
CountyWashington County
StateRhode Island
Coordinates41.45177, -71.49665
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating47.8 US tons
Inventory rating37.1 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,515 (2021)
Projected traffic9,367 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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 statusListed on the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.1 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Ri 108 Kngstown RD over Saugatucket River built?

It was built in 1885, making it 140 years old in 2025. It was reconstructed in 1930.

What condition is Ri 108 Kngstown RD over Saugatucket 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 August 2024.

How much traffic does Ri 108 Kngstown RD over Saugatucket River carry?

About 8,515 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is Ri 108 Kngstown RD over Saugatucket River?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 32 ft wide.

Who owns Ri 108 Kngstown RD over Saugatucket River?

It is owned by the State Highway Agency.