US Bridges

Route 172 over Transylvania Brook

Fair

New Haven County, Connecticut · 1 MI South of JCT RTE 67 · Structure no. 02751

Built
1935
90 years old
Condition
Fair
inspected February 2025
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
3,900
2020 count
Owner
State
State Highway Agency

About this bridge

Route 172 over Transylvania Brook is a concrete slab carrying Route 172 over Transylvania Brook in New Haven County, Connecticut. It was built in 1935, so it is 90 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 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 3,900 vehicles a day, roughly 5% of them trucks, projected to reach 5,795 by 2040. The structure is 22 ft (6.7 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesRoute 172
CrossesTransylvania Brook
Location1 MI South of JCT RTE 67
RouteState Highway 172
CountyNew Haven County
StateConnecticut
Coordinates41.49915, -73.25655
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating52.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,900 (2020)
Projected traffic5,795 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

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

Frequently asked questions

When was Route 172 over Transylvania Brook built?

It was built in 1935, making it 90 years old in 2025.

What condition is Route 172 over Transylvania Brook 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 February 2025.

How much traffic does Route 172 over Transylvania Brook carry?

About 3,900 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Route 172 over Transylvania Brook?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 35 ft wide.

Who owns Route 172 over Transylvania Brook?

It is owned by the State Highway Agency.