US Bridges

C3029 over Mill Brook

Good

Chittenden County, Vermont · 0.13 MI to JCT W CL2 TH3 · Structure no. 100409003004091

Built
1995
30 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
93 ft
1 main span
Daily traffic
160
2019 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

C3029 over Mill Brook is a steel stringer/multi-beam or girder carrying C3029 over Mill Brook in Chittenden County, Vermont. It was built in 1995, so it is 30 years old, younger than the Vermont average of 60.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 160 vehicles a day, roughly 2% of them trucks, projected to reach 168 by 2029. The structure is 93 ft (28.3 m) long and 24 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesC3029
CrossesMill Brook
Location0.13 MI to JCT W CL2 TH3
StateVermont
Coordinates44.45276, -72.96401
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating80 US tons
Inventory rating48 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length93 ft (28.3 m)
Longest span88 ft (26.8 m)
Deck width24 ft (7.2 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic160 (2019)
Projected traffic168 by 2029
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$818,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was C3029 over Mill Brook built?

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

What condition is C3029 over Mill Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does C3029 over Mill Brook carry?

About 160 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is C3029 over Mill Brook?

The structure is 93 ft (28.3 m) long with a longest span of 88 ft (26.8 m) and a deck 24 ft wide.

Who owns C3029 over Mill Brook?

It is owned by the Town or Township Highway Agency.