US Bridges

C4004 over Mill Brook

Fair

Bennington County, Vermont · JCT TH 4 & TH 8 · Structure no. 100215001102151

Built
1961
64 years old, rebuilt 2018
Condition
Fair
inspected September 2024
Type
Slab
Concrete
Length
29 ft
1 main span
Daily traffic
50
2019 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

C4004 over Mill Brook is a concrete slab carrying C4004 over Mill Brook in Bennington County, Vermont. It was built in 1961 and reconstructed in 2018, so it is 64 years old, older than the Vermont average of 60.8 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 50 vehicles a day, roughly 2% of them trucks, projected to reach 53 by 2029. The structure is 29 ft (8.8 m) long and 17 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesC4004
CrossesMill Brook
LocationJCT TH 4 & TH 8
StateVermont
Coordinates43.11151, -73.10259
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating38 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length29 ft (8.8 m)
Longest span28 ft (8.5 m)
Deck width17 ft (5.1 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2019)
Projected traffic53 by 2029
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 C4004 over Mill Brook built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2018.

What condition is C4004 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 September 2024.

How much traffic does C4004 over Mill Brook carry?

About 50 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is C4004 over Mill Brook?

The structure is 29 ft (8.8 m) long with a longest span of 28 ft (8.5 m) and a deck 17 ft wide.

Who owns C4004 over Mill Brook?

It is owned by the Town or Township Highway Agency.