US Bridges

Greenfield Parkway over Riddle Brook

PoorClosed to traffic

Hillsborough County, New Hampshire · .1 West of Liberty Hill R · Structure no. 001901570006800

Built
2000
25 years old
Condition
Poor
inspected July 2024
Type
Culvert
Steel
Length
26 ft
1 main span
Daily traffic
571
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Greenfield Parkway over Riddle Brook is a steel culvert carrying Greenfield Parkway over Riddle Brook in Hillsborough County, New Hampshire. It was built in 2000, so it is 25 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 poor condition with a lowest component rating of 0 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. Its operating status is: closed to all traffic.

It carries about 571 vehicles a day, projected to reach 845 by 2043. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesGreenfield Parkway
CrossesRiddle Brook
Location.1 West of Liberty Hill R
RouteCity Street 0
CountyHillsborough County
StateNew Hampshire
Coordinates42.90695, -71.50278
Functional classUrban 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
Channel and channel protection8 Very GoodNo problems noted.
Culvert0 FailedOut of service and beyond corrective action.
Last inspectionJuly 2024
Inspection intervalevery 16 months
Operating statusClosed to all traffic
ScourFoundations stable; scour above top of footing
Structural evaluation0: Immediate repair necessary to put back in service
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span21 ft (6.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic571 (2023)
Projected traffic845 by 2043
Trucks0%
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 Greenfield Parkway over Riddle Brook built?

It was built in 2000, making it 25 years old in 2025.

What condition is Greenfield Parkway over Riddle 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 July 2024.

How much traffic does Greenfield Parkway over Riddle Brook carry?

About 571 vehicles per day (2023 count).

How long is Greenfield Parkway over Riddle Brook?

The structure is 26 ft (7.9 m) long with a longest span of 21 ft (6.4 m).

Who owns Greenfield Parkway over Riddle Brook?

It is owned by the City or Municipal Highway Agency.