US Bridges

Town Road #100 over Archertown Brook

Good

Grafton County, New Hampshire · 0.1 MI FR Miller Road · Structure no. 020301140013300

Built
2021
4 years old
Condition
Good
inspected September 2023
Type
Frame
Concrete
Length
21 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Town Road #100 over Archertown Brook is a concrete frame carrying Town Road #100 over Archertown Brook in Grafton County, New Hampshire. It was built in 2021, so it is 4 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 96 vehicles a day, roughly 4% of them trucks, projected to reach 142 by 2043. The structure is 21 ft (6.5 m) long and 24 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesTown Road #100
CrossesArchertown Brook
Location0.1 MI FR Miller Road
CountyGrafton County
StateNew Hampshire
Coordinates43.91379, -72.09304
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating58 US tons
Inventory rating44.6 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length21 ft (6.5 m)
Longest span19 ft (5.9 m)
Deck width24 ft (7.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Town Road #100 over Archertown Brook built?

It was built in 2021, making it 4 years old in 2025.

What condition is Town Road #100 over Archertown Brook 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 September 2023.

How much traffic does Town Road #100 over Archertown Brook carry?

About 96 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Town Road #100 over Archertown Brook?

The structure is 21 ft (6.5 m) long with a longest span of 19 ft (5.9 m) and a deck 24 ft wide.

Who owns Town Road #100 over Archertown Brook?

It is owned by the City or Municipal Highway Agency.