US Bridges

Route 17 over Allyns Brook

Fair

Middlesex County, Connecticut · 0.6 MI N. of Route 79 · Structure no. 06513

Built
1995
30 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
83 ft
1 main span
Daily traffic
15,200
2022 count
Owner
State
State Highway Agency

About this bridge

Route 17 over Allyns Brook is a prestressed concrete box beam or girders - multiple carrying Route 17 over Allyns Brook in Middlesex County, Connecticut. It was built in 1995, so it is 30 years old, younger 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 15,200 vehicles a day, roughly 6% of them trucks, projected to reach 22,586 by 2042. The structure is 83 ft (25.3 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRoute 17
CrossesAllyns Brook
Location0.6 MI N. of Route 79
RouteState Highway 17
CountyMiddlesex County
StateConnecticut
Coordinates41.47394, -72.68027
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.4 US tons
Inventory rating45.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length83 ft (25.3 m)
Longest span78 ft (23.8 m)
Deck width49 ft (15 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,200 (2022)
Projected traffic22,586 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 17 over Allyns Brook built?

It was built in 1995, making it 30 years old in 2025.

What condition is Route 17 over Allyns 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 October 2023.

How much traffic does Route 17 over Allyns Brook carry?

About 15,200 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Route 17 over Allyns Brook?

The structure is 83 ft (25.3 m) long with a longest span of 78 ft (23.8 m) and a deck 49 ft wide.

Who owns Route 17 over Allyns Brook?

It is owned by the State Highway Agency.