US Bridges

C3021 over Miller Run

PoorPosted for load

Caledonia County, Vermont · 0.1 MI JCT TH 21 + VT122 · Structure no. 100317002303171

Built
1928
97 years old, rebuilt 1974
Condition
Poor
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
46 ft
1 main span
Daily traffic
5
2019 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

C3021 over Miller Run is a steel stringer/multi-beam or girder carrying C3021 over Miller Run in Caledonia County, Vermont. It was built in 1928 and reconstructed in 1974, so it is 97 years old, older than the Vermont average of 60.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 5 vehicles a day, roughly 2% of them trucks, projected to reach 6 by 2029. The structure is 46 ft (14 m) long and 15 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesC3021
CrossesMiller Run
Location0.1 MI JCT TH 21 + VT122
StateVermont
Coordinates44.58697, -72.08521
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating21.1 US tons
Inventory rating15 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length46 ft (14 m)
Longest span43 ft (13.1 m)
Deck width15 ft (4.5 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2019)
Projected traffic6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$510,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was C3021 over Miller Run built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1974.

What condition is C3021 over Miller Run in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does C3021 over Miller Run carry?

About 5 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is C3021 over Miller Run?

The structure is 46 ft (14 m) long with a longest span of 43 ft (13.1 m) and a deck 15 ft wide.

Who owns C3021 over Miller Run?

It is owned by the Town or Township Highway Agency.