US Bridges

ST 9 Main ST over Water Mill River

Fair

Hampshire County, Massachusetts · At JCT of River RD · Structure no. W360100B9DOTNBI

Built
1933
92 years old
Condition
Fair
inspected February 2025
Type
Tee Beam
Concrete Continuous
Length
80 ft
2 main spans
Daily traffic
15,400
2013 count
Owner
State
State Highway Agency

About this bridge

ST 9 Main ST over Water Mill River is a concrete continuous tee beam carrying ST 9 Main ST over Water Mill River in Hampshire County, Massachusetts. It was built in 1933, so it is 92 years old, older 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 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 15,400 vehicles a day, roughly 6% of them trucks, projected to reach 13,740 by 2032. The structure is 80 ft (24.4 m) long and 49 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesST 9 Main ST
CrossesWater Mill River
LocationAt JCT of River RD
RouteState Highway 9
CountyHampshire County
StateMassachusetts
Coordinates42.38938, -72.72045
Functional classRural Principal Arterial - Other

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating47.8 US tons
Inventory rating30.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length80 ft (24.4 m)
Longest span37 ft (11.3 m)
Deck width49 ft (14.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,400 (2013)
Projected traffic13,740 by 2032
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.6 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST 9 Main ST over Water Mill River built?

It was built in 1933, making it 92 years old in 2025.

What condition is ST 9 Main ST over Water Mill 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 February 2025.

How much traffic does ST 9 Main ST over Water Mill River carry?

About 15,400 vehicles per day (2013 count), of which roughly 6% are trucks.

How long is ST 9 Main ST over Water Mill River?

The structure is 80 ft (24.4 m) long with a longest span of 37 ft (11.3 m) and a deck 49 ft wide.

Who owns ST 9 Main ST over Water Mill River?

It is owned by the State Highway Agency.