US Bridges

Route 34 over Four Mile Brook

Fair

New Haven County, Connecticut · 100 Ft W of Route 188 · Structure no. 00945

Built
1930
95 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
11,100
2015 count
Owner
State
State Highway Agency

About this bridge

Route 34 over Four Mile Brook is a concrete slab carrying Route 34 over Four Mile Brook in New Haven County, Connecticut. It was built in 1930, so it is 95 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 11,100 vehicles a day, roughly 4% of them trucks, projected to reach 16,493 by 2035. The structure is 23 ft (7 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesRoute 34
CrossesFour Mile Brook
Location100 Ft W of Route 188
RouteState Highway 34
CountyNew Haven County
StateConnecticut
Coordinates41.36429, -73.14031
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span20 ft (6.1 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,100 (2015)
Projected traffic16,493 by 2035
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 34 over Four Mile Brook built?

It was built in 1930, making it 95 years old in 2025.

What condition is Route 34 over Four Mile 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 2023.

How much traffic does Route 34 over Four Mile Brook carry?

About 11,100 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is Route 34 over Four Mile Brook?

The structure is 23 ft (7 m) long with a longest span of 20 ft (6.1 m) and a deck 32 ft wide.

Who owns Route 34 over Four Mile Brook?

It is owned by the State Highway Agency.