US Bridges

Vt 0100B Alt over Mad River

Good

Washington County, Vermont · 0.6 MI N Jct. VT.100 · Structure no. 201212000212121

Built
2020
5 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
100 ft
1 main span
Daily traffic
3,200
2018 count
Owner
State
State Highway Agency

About this bridge

Vt 0100B Alt over Mad River is a steel stringer/multi-beam or girder carrying Vt 0100B Alt over Mad River in Washington County, Vermont. It was built in 2020, so it is 5 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 3,200 vehicles a day, roughly 6% of them trucks, projected to reach 3,360 by 2028. The structure is 100 ft (30.5 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesVt 0100B Alt
CrossesMad River
Location0.6 MI N Jct. VT.100
RouteState Highway 100B
CountyWashington County
StateVermont
Coordinates44.24544, -72.76955
Functional classRural Major Collector

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 rating55 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length100 ft (30.5 m)
Longest span92 ft (28 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,200 (2018)
Projected traffic3,360 by 2028
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.2 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Vt 0100B Alt over Mad River built?

It was built in 2020, making it 5 years old in 2025.

What condition is Vt 0100B Alt over Mad River 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 Vt 0100B Alt over Mad River carry?

About 3,200 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is Vt 0100B Alt over Mad River?

The structure is 100 ft (30.5 m) long with a longest span of 92 ft (28 m) and a deck 33 ft wide.

Who owns Vt 0100B Alt over Mad River?

It is owned by the State Highway Agency.