US Bridges

Ri 77 Main RD over Nanaquaket Pond

Fair

Newport County, Rhode Island · 0.4 MI N of JCT Ri 177 · Structure no. 000000000002840

Built
1933
92 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
24 ft
1 main span
Daily traffic
6,868
2014 count
Owner
State
State Highway Agency

About this bridge

Ri 77 Main RD over Nanaquaket Pond is a concrete slab carrying Ri 77 Main RD over Nanaquaket Pond in Newport County, Rhode Island. It was built in 1933, so it is 92 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 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 6,868 vehicles a day, roughly 10% of them trucks, projected to reach 8,242 by 2036. The structure is 24 ft (7.3 m) long and 53 ft wide.

Location

Open in Google Maps
CarriesRi 77 Main RD
CrossesNanaquaket Pond
Location0.4 MI N of JCT Ri 177
RouteState Highway 77
CountyNewport County
StateRhode Island
Coordinates41.61788, -71.20441
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
Deck7 GoodSome minor problems.
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 inspectionApril 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 geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.4 US tons
Inventory rating32.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length24 ft (7.3 m)
Longest span20 ft (6.2 m)
Deck width53 ft (16.1 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,868 (2014)
Projected traffic8,242 by 2036
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.8 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Ri 77 Main RD over Nanaquaket Pond built?

It was built in 1933, making it 92 years old in 2025.

What condition is Ri 77 Main RD over Nanaquaket Pond 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 2023.

How much traffic does Ri 77 Main RD over Nanaquaket Pond carry?

About 6,868 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Ri 77 Main RD over Nanaquaket Pond?

The structure is 24 ft (7.3 m) long with a longest span of 20 ft (6.2 m) and a deck 53 ft wide.

Who owns Ri 77 Main RD over Nanaquaket Pond?

It is owned by the State Highway Agency.