US Bridges

US 3 over Baboosic Brook

Poor

Hillsborough County, New Hampshire · 5.9 MI N Nashua Tl · Structure no. 016801180013500

Built
1933
92 years old
Condition
Poor
inspected November 2024
Type
Culvert
Concrete
Length
30 ft
1 main span
Daily traffic
13,024
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

US 3 over Baboosic Brook is a concrete culvert carrying US 3 over Baboosic Brook in Hillsborough County, New Hampshire. It was built in 1933, 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 13,024 vehicles a day, roughly 7% of them trucks, projected to reach 19,275 by 2043. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 3
CrossesBaboosic Brook
Location5.9 MI N Nashua Tl
RouteU.S. Route 3
CountyHillsborough County
StateNew Hampshire
Coordinates42.8706, -71.49287
Functional classUrban Minor Arterial

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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
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
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 15
Structure length30 ft (9.1 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,024 (2023)
Projected traffic19,275 by 2043
Trucks7%
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 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 US 3 over Baboosic Brook built?

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

What condition is US 3 over Baboosic Brook 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 US 3 over Baboosic Brook carry?

About 13,024 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 3 over Baboosic Brook?

The structure is 30 ft (9.1 m) long with a longest span of 20 ft (6.1 m).

Who owns US 3 over Baboosic Brook?

It is owned by the City or Municipal Highway Agency.