US Bridges

C3029 over Cobb Brook

Good

Chittenden County, Vermont · 0.2 MI to JCT W CL2 TH1 · Structure no. 100408002904081

Built
1914
111 years old, rebuilt 1988
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
36 ft
1 main span
Daily traffic
10
2019 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

C3029 over Cobb Brook is a steel stringer/multi-beam or girder carrying C3029 over Cobb Brook in Chittenden County, Vermont. It was built in 1914 and reconstructed in 1988, so it is 111 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10 vehicles a day, roughly 2% of them trucks, projected to reach 11 by 2029. The structure is 36 ft (11 m) long and 13 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesC3029
CrossesCobb Brook
Location0.2 MI to JCT W CL2 TH1
CountyChittenden County
StateVermont
Coordinates44.27281, -72.95863
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating66 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length36 ft (11 m)
Longest span33 ft (10.1 m)
Deck width13 ft (4.1 m)
Roadway width13 ft (4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2019)
Projected traffic11 by 2029
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-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$219,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was C3029 over Cobb Brook built?

It was built in 1914, making it 111 years old in 2025. It was reconstructed in 1988.

What condition is C3029 over Cobb 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 October 2023.

How much traffic does C3029 over Cobb Brook carry?

About 10 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is C3029 over Cobb Brook?

The structure is 36 ft (11 m) long with a longest span of 33 ft (10.1 m) and a deck 13 ft wide.

Who owns C3029 over Cobb Brook?

It is owned by the Town or Township Highway Agency.