US Bridges

I 91 over Water Mill Brook

Fair

Franklin County, Massachusetts · Mm 45.0 on I-91 SB · Structure no. G120560XQDOTNBI

Built
1964
61 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
26,573
2023 count
Owner
State
State Highway Agency

About this bridge

I 91 over Water Mill Brook is a concrete continuous culvert carrying I 91 over Water Mill Brook in Franklin County, Massachusetts. It was built in 1964, so it is 61 years old, younger than the Massachusetts average of 63.8 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 26,573 vehicles a day, roughly 11% of them trucks, projected to reach 37,114 by 2031. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 91
CrossesWater Mill Brook
LocationMm 45.0 on I-91 SB
RouteInterstate 91
CountyFranklin County
StateMassachusetts
Coordinates42.61001, -72.607
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length22 ft (6.7 m)
Longest span10 ft (3.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,573 (2023)
Projected traffic37,114 by 2031
Trucks11%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.7 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 91 over Water Mill Brook built?

It was built in 1964, making it 61 years old in 2025.

What condition is I 91 over Water Mill 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 March 2024.

How much traffic does I 91 over Water Mill Brook carry?

About 26,573 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is I 91 over Water Mill Brook?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3.2 m).

Who owns I 91 over Water Mill Brook?

It is owned by the State Highway Agency.