US Bridges

Route 128 over Mill Brook

Fair

Litchfield County, Connecticut · .20 MI E of US 7 · Structure no. 02651

Built
1924
101 years old, rebuilt 1993
Condition
Fair
inspected June 2023
Type
Slab
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
1,100
2021 count
Owner
State
State Highway Agency

About this bridge

Route 128 over Mill Brook is a prestressed concrete slab carrying Route 128 over Mill Brook in Litchfield County, Connecticut. It was built in 1924 and reconstructed in 1993, so it is 101 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 1,100 vehicles a day, roughly 5% of them trucks, projected to reach 1,634 by 2041. The structure is 30 ft (9.1 m) long and 35 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesRoute 128
CrossesMill Brook
Location.20 MI E of US 7
RouteState Highway 128
Coordinates41.87162, -73.36117
Functional classRural Major 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
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 inspectionJune 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating39.2 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span23 ft (7 m)
Deck width35 ft (10.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2021)
Projected traffic1,634 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 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 128 over Mill Brook built?

It was built in 1924, making it 101 years old in 2025. It was reconstructed in 1993.

What condition is Route 128 over 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 June 2023.

How much traffic does Route 128 over Mill Brook carry?

About 1,100 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Route 128 over Mill Brook?

The structure is 30 ft (9.1 m) long with a longest span of 23 ft (7 m) and a deck 35 ft wide.

Who owns Route 128 over Mill Brook?

It is owned by the State Highway Agency.