US Bridges

Potter Road over Conway Lake Inlet

Good

Carroll County, New Hampshire · 1.2 Mi. RTE 153 · Structure no. 007300720013700

Built
2009
16 years old
Condition
Good
inspected September 2023
Type
Slab
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Potter Road over Conway Lake Inlet is a prestressed concrete slab carrying Potter Road over Conway Lake Inlet in Carroll County, New Hampshire. It was built in 2009, so it is 16 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 51 ft (15.5 m) long and 21 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesPotter Road
CrossesConway Lake Inlet
Location1.2 Mi. RTE 153
CountyCarroll County
StateNew Hampshire
Coordinates43.93218, -71.06284
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating84.7 US tons
Inventory rating46.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length51 ft (15.5 m)
Longest span47 ft (14.3 m)
Deck width21 ft (6.4 m)
Roadway width17 ft (5.1 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 closed3.1 mi (5 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 Potter Road over Conway Lake Inlet built?

It was built in 2009, making it 16 years old in 2025.

What condition is Potter Road over Conway Lake Inlet 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 Potter Road over Conway Lake Inlet carry?

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

How long is Potter Road over Conway Lake Inlet?

The structure is 51 ft (15.5 m) long with a longest span of 47 ft (14.3 m) and a deck 21 ft wide.

Who owns Potter Road over Conway Lake Inlet?

It is owned by the City or Municipal Highway Agency.