US Bridges

Frye Mill Road over Burton Pond Outlet

Poor

Hillsborough County, New Hampshire · 1.2MI.FR.ISSAC Frye Hwy. · Structure no. 027700800014500

Built
1920
105 years old, rebuilt 2014
Condition
Poor
inspected November 2024
Type
Slab
Concrete
Length
28 ft
1 main span
Daily traffic
36
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Frye Mill Road over Burton Pond Outlet is a concrete slab carrying Frye Mill Road over Burton Pond Outlet in Hillsborough County, New Hampshire. It was built in 1920 and reconstructed in 2014, so it is 105 years old, older than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 36 vehicles a day, projected to reach 53 by 2043. The structure is 28 ft (8.5 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesFrye Mill Road
CrossesBurton Pond Outlet
Location1.2MI.FR.ISSAC Frye Hwy.
CountyHillsborough County
StateNew Hampshire
Coordinates42.85659, -71.78823
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 16 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating74.1 US tons
Inventory rating57.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length28 ft (8.5 m)
Longest span22 ft (6.7 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36 (2023)
Projected traffic53 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 statusPossibly eligible for the National Register; requires further investigation
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 Frye Mill Road over Burton Pond Outlet built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 2014.

What condition is Frye Mill Road over Burton Pond Outlet in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does Frye Mill Road over Burton Pond Outlet carry?

About 36 vehicles per day (2023 count).

How long is Frye Mill Road over Burton Pond Outlet?

The structure is 28 ft (8.5 m) long with a longest span of 22 ft (6.7 m) and a deck 16 ft wide.

Who owns Frye Mill Road over Burton Pond Outlet?

It is owned by the City or Municipal Highway Agency.