US Bridges

Contoocook Falls R over Contoocook River

Poor

Hillsborough County, New Hampshire · 0.3 Mi. Henniker Tl · Structure no. 012201710006400

Built
1933
92 years old, rebuilt 1991
Condition
Poor
inspected August 2024
Type
Girder and Floorbeam System
Steel
Length
224 ft
2 main spans
Daily traffic
712
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Contoocook Falls R over Contoocook River is a steel girder and floorbeam system carrying Contoocook Falls R over Contoocook River in Hillsborough County, New Hampshire. It was built in 1933 and reconstructed in 1991, so it is 92 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 712 vehicles a day, roughly 4% of them trucks, projected to reach 1,053 by 2043. The structure is 224 ft (68.3 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesContoocook Falls R
CrossesContoocook River
Location0.3 Mi. Henniker Tl
Coordinates43.13638, -71.87446
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 16 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25 US tons
Inventory rating17 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length224 ft (68.3 m)
Longest span104 ft (31.7 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic712 (2023)
Projected traffic1,053 by 2043
Trucks4%
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusEligible 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 Contoocook Falls R over Contoocook River built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1991.

What condition is Contoocook Falls R over Contoocook River 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 August 2024.

How much traffic does Contoocook Falls R over Contoocook River carry?

About 712 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Contoocook Falls R over Contoocook River?

The structure is 224 ft (68.3 m) long with a longest span of 104 ft (31.7 m) and a deck 29 ft wide.

Who owns Contoocook Falls R over Contoocook River?

It is owned by the City or Municipal Highway Agency.