US Bridges

C3011 over Simpson Brook

FairPosted for load

Windham County, Vermont · At JCT C3 TH11 & TH13 · Structure no. 101317003613171

Built
1939
86 years old, rebuilt 1963
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
54 ft
1 main span
Daily traffic
40
2019 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

C3011 over Simpson Brook is a steel stringer/multi-beam or girder carrying C3011 over Simpson Brook in Windham County, Vermont. It was built in 1939 and reconstructed in 1963, so it is 86 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. Its operating status is: posted for load restriction.

It carries about 40 vehicles a day, roughly 2% of them trucks, projected to reach 42 by 2029. The structure is 54 ft (16.5 m) long and 12 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesC3011
CrossesSimpson Brook
LocationAt JCT C3 TH11 & TH13
CountyWindham County
StateVermont
Coordinates43.09137, -72.66551
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating22 US tons
Inventory rating13 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length54 ft (16.5 m)
Longest span50 ft (15.2 m)
Deck width12 ft (3.7 m)
Roadway width12 ft (3.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2019)
Projected traffic42 by 2029
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$279,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was C3011 over Simpson Brook built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1963.

What condition is C3011 over Simpson 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 C3011 over Simpson Brook carry?

About 40 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is C3011 over Simpson Brook?

The structure is 54 ft (16.5 m) long with a longest span of 50 ft (15.2 m) and a deck 12 ft wide.

Who owns C3011 over Simpson Brook?

It is owned by the Town or Township Highway Agency.