US Bridges

Vt 0100B Alt over Mad River

Fair

Washington County, Vermont · 2.3 MI S Jct. U.S.2 · Structure no. 200167000712122

Built
1967
58 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
307 ft
2 main spans
Daily traffic
2,700
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 1967, so it is 58 years old, younger 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 2,700 vehicles a day, roughly 6% of them trucks, projected to reach 2,835 by 2028. The structure is 307 ft (93.6 m) long and 35 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
Location2.3 MI S Jct. U.S.2
RouteState Highway 100B
CountyWashington County
StateVermont
Coordinates44.28624, -72.70359
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length307 ft (93.6 m)
Longest span150 ft (45.7 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,700 (2018)
Projected traffic2,835 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Vt 0100B Alt over Mad River built?

It was built in 1967, making it 58 years old in 2025.

What condition is Vt 0100B Alt over Mad River 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 2023.

How much traffic does Vt 0100B Alt over Mad River carry?

About 2,700 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is Vt 0100B Alt over Mad River?

The structure is 307 ft (93.6 m) long with a longest span of 150 ft (45.7 m) and a deck 35 ft wide.

Who owns Vt 0100B Alt over Mad River?

It is owned by the State Highway Agency.