US Bridges

Town House Road over Mill Brook

Fair

Sullivan County, New Hampshire · 2.4 Mi. from Jct. 12-A · Structure no. 005501000009900

Built
1940
85 years old
Condition
Fair
inspected April 2024
Type
Frame
Concrete
Length
24 ft
1 main span
Daily traffic
641
2023 count
Owner
State
State Highway Agency

About this bridge

Town House Road over Mill Brook is a concrete frame carrying Town House Road over Mill Brook in Sullivan County, New Hampshire. It was built in 1940, so it is 85 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 fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 641 vehicles a day, roughly 10% of them trucks, projected to reach 948 by 2043. The structure is 24 ft (7.3 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesTown House Road
CrossesMill Brook
Location2.4 Mi. from Jct. 12-A
RouteState Highway 0
CountySullivan County
StateNew Hampshire
Coordinates43.46719, -72.35035
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating36.9 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length24 ft (7.3 m)
Longest span21 ft (6.4 m)
Deck width37 ft (11.2 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic641 (2023)
Projected traffic948 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Town House Road over Mill Brook built?

It was built in 1940, making it 85 years old in 2025.

What condition is Town House Road over Mill Brook in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does Town House Road over Mill Brook carry?

About 641 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Town House Road over Mill Brook?

The structure is 24 ft (7.3 m) long with a longest span of 21 ft (6.4 m) and a deck 37 ft wide.

Who owns Town House Road over Mill Brook?

It is owned by the State Highway Agency.