US Bridges

Riverdale Road over Mid Br Piscataquog River

Good

Hillsborough County, New Hampshire · 65 Ft FR Gregg Mill Road · Structure no. 017901310014700

Built
2015
10 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
68 ft
1 main span
Daily traffic
204
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Riverdale Road over Mid Br Piscataquog River is a steel stringer/multi-beam or girder carrying Riverdale Road over Mid Br Piscataquog River in Hillsborough County, New Hampshire. It was built in 2015, so it is 10 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 204 vehicles a day, roughly 4% of them trucks, projected to reach 301 by 2043. The structure is 68 ft (20.7 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRiverdale Road
CrossesMid Br Piscataquog River
Location65 Ft FR Gregg Mill Road
CountyHillsborough County
StateNew Hampshire
Coordinates43.00572, -71.66415
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
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 rating86 US tons
Inventory rating66.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length68 ft (20.7 m)
Longest span64 ft (19.5 m)
Deck width27 ft (8.2 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic204 (2023)
Projected traffic301 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Riverdale Road over Mid Br Piscataquog River built?

It was built in 2015, making it 10 years old in 2025.

What condition is Riverdale Road over Mid Br Piscataquog 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 July 2023.

How much traffic does Riverdale Road over Mid Br Piscataquog River carry?

About 204 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Riverdale Road over Mid Br Piscataquog River?

The structure is 68 ft (20.7 m) long with a longest span of 64 ft (19.5 m) and a deck 27 ft wide.

Who owns Riverdale Road over Mid Br Piscataquog River?

It is owned by the City or Municipal Highway Agency.