US Bridges

Route 80 over Hammonasset River

Fair

New Haven County, Connecticut · 1.4 MI E of Route 79 · Structure no. 01132

Built
1934
91 years old, rebuilt 1970
Condition
Fair
inspected August 2024
Type
Arch - Deck
Concrete
Length
200 ft
1 main span
Daily traffic
4,600
2016 count
Owner
State
State Highway Agency

About this bridge

Route 80 over Hammonasset River is a concrete arch - deck carrying Route 80 over Hammonasset River in New Haven County, Connecticut. It was built in 1934 and reconstructed in 1970, so it is 91 years old, older than the Connecticut average of 56.7 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 4,600 vehicles a day, roughly 6% of them trucks, projected to reach 6,835 by 2036. The structure is 200 ft (61 m) long and 35 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesRoute 80
CrossesHammonasset River
Location1.4 MI E of Route 79
RouteState Highway 80
CountyNew Haven County
StateConnecticut
Coordinates41.35721, -72.6126
Functional classRural 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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26.1 US tons
Inventory rating17.9 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadH 20
Structure length200 ft (61 m)
Longest span100 ft (30.5 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,600 (2016)
Projected traffic6,835 by 2036
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 80 over Hammonasset River built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1970.

What condition is Route 80 over Hammonasset 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 Route 80 over Hammonasset River carry?

About 4,600 vehicles per day (2016 count), of which roughly 6% are trucks.

How long is Route 80 over Hammonasset River?

The structure is 200 ft (61 m) long with a longest span of 100 ft (30.5 m) and a deck 35 ft wide.

Who owns Route 80 over Hammonasset River?

It is owned by the State Highway Agency.