US Bridges

Great Hollow Road over Mink Brook

Fair

Grafton County, New Hampshire · .76 MI N Lebanon Tl · Structure no. 011400980005300

Built
1901
124 years old
Condition
Fair
inspected August 2023
Type
Arch - Deck
Masonry
Length
27 ft
1 main span
Daily traffic
2,168
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Great Hollow Road over Mink Brook is a masonry arch - deck carrying Great Hollow Road over Mink Brook in Grafton County, New Hampshire. It was built in 1901, so it is 124 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 2,168 vehicles a day, roughly 4% of them trucks, projected to reach 3,208 by 2043. The structure is 27 ft (8.2 m) long and 25 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesGreat Hollow Road
CrossesMink Brook
Location.76 MI N Lebanon Tl
RouteState Highway 0
CountyGrafton County
StateNew Hampshire
Coordinates43.68702, -72.23302
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.5 US tons
Inventory rating29.7 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span27 ft (8.2 m)
Deck width25 ft (7.6 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,168 (2023)
Projected traffic3,208 by 2043
Trucks4%
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 statusListed on 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 Great Hollow Road over Mink Brook built?

It was built in 1901, making it 124 years old in 2025.

What condition is Great Hollow Road over Mink 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 August 2023.

How much traffic does Great Hollow Road over Mink Brook carry?

About 2,168 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Great Hollow Road over Mink Brook?

The structure is 27 ft (8.2 m) long with a longest span of 27 ft (8.2 m) and a deck 25 ft wide.

Who owns Great Hollow Road over Mink Brook?

It is owned by the City or Municipal Highway Agency.