US Bridges

Mill Road over CSX

Fair

Strafford County, New Hampshire · Town RD · Structure no. 007000920010700

Built
1973
52 years old
Condition
Fair
inspected September 2023
Type
Slab
Prestressed Concrete
Length
37 ft
1 main span
Daily traffic
1,379
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mill Road over CSX is a prestressed concrete slab carrying Mill Road over CSX in Strafford County, New Hampshire. It was built in 1973, so it is 52 years old, younger than the New Hampshire average of 56.9 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 1,379 vehicles a day, roughly 10% of them trucks, projected to reach 2,040 by 2043. The structure is 37 ft (11.3 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesMill Road
CrossesCSX
LocationTown RD
CountyStrafford County
StateNew Hampshire
Coordinates43.12863, -70.93889
Functional classRural Minor 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.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span27 ft (8.2 m)
Deck width33 ft (10.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,379 (2023)
Projected traffic2,040 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mill Road over CSX built?

It was built in 1973, making it 52 years old in 2025.

What condition is Mill Road over CSX 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 Mill Road over CSX carry?

About 1,379 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Mill Road over CSX?

The structure is 37 ft (11.3 m) long with a longest span of 27 ft (8.2 m) and a deck 33 ft wide.

Who owns Mill Road over CSX?

It is owned by the City or Municipal Highway Agency.