US Bridges

Mill Street over Lamprey River

Good

Rockingham County, New Hampshire · Town RD · Structure no. 007801120005500

Built
2004
21 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
117 ft
1 main span
Daily traffic
1,138
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mill Street over Lamprey River is a prestressed concrete box beam or girders - multiple carrying Mill Street over Lamprey River in Rockingham County, New Hampshire. It was built in 2004, so it is 21 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,138 vehicles a day, roughly 4% of them trucks, projected to reach 1,684 by 2043. The structure is 117 ft (35.7 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMill Street
CrossesLamprey River
LocationTown RD
Coordinates43.03816, -71.07086
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 alignment6: Equal to present minimum criteria
Operating rating47.5 US tons
Inventory rating40.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length117 ft (35.7 m)
Longest span113 ft (34.4 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,138 (2023)
Projected traffic1,684 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$314,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mill Street over Lamprey River built?

It was built in 2004, making it 21 years old in 2025.

What condition is Mill Street over Lamprey 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 October 2024.

How much traffic does Mill Street over Lamprey River carry?

About 1,138 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Mill Street over Lamprey River?

The structure is 117 ft (35.7 m) long with a longest span of 113 ft (34.4 m) and a deck 28 ft wide.

Who owns Mill Street over Lamprey River?

It is owned by the City or Municipal Highway Agency.