US Bridges

NH101 over Tide Mill Creek

Good

Rockingham County, New Hampshire · 1.2 MI from JCT US 1 · Structure no. 011102070009400

Built
1988
37 years old, rebuilt 2019
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
126 ft
1 main span
Daily traffic
7,203
2023 count
Owner
State
State Highway Agency

About this bridge

NH101 over Tide Mill Creek is a steel stringer/multi-beam or girder carrying NH101 over Tide Mill Creek in Rockingham County, New Hampshire. It was built in 1988 and reconstructed in 2019, so it is 37 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 7,203 vehicles a day, roughly 7% of them trucks, projected to reach 10,660 by 2043. The structure is 126 ft (38.4 m) long and 47 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesNH101
CrossesTide Mill Creek
Location1.2 MI from JCT US 1
RouteState Highway 51
Coordinates42.92207, -70.82321
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating47.3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length126 ft (38.4 m)
Longest span120 ft (36.6 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,203 (2023)
Projected traffic10,660 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 NH101 over Tide Mill Creek built?

It was built in 1988, making it 37 years old in 2025. It was reconstructed in 2019.

What condition is NH101 over Tide Mill Creek 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 May 2023.

How much traffic does NH101 over Tide Mill Creek carry?

About 7,203 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is NH101 over Tide Mill Creek?

The structure is 126 ft (38.4 m) long with a longest span of 120 ft (36.6 m) and a deck 47 ft wide.

Who owns NH101 over Tide Mill Creek?

It is owned by the State Highway Agency.