US Bridges

Blake Road over Lamprey River

Fair

Rockingham County, New Hampshire · Town RD · Structure no. 007800590005400

Built
1952
73 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Concrete
Length
41 ft
1 main span
Daily traffic
568
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Blake Road over Lamprey River is a concrete tee beam carrying Blake Road over Lamprey River in Rockingham County, New Hampshire. It was built in 1952, so it is 73 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 568 vehicles a day, roughly 4% of them trucks, projected to reach 840 by 2043. The structure is 41 ft (12.5 m) long and 23 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesBlake Road
CrossesLamprey River
LocationTown RD
CountyRockingham County
StateNew Hampshire
Coordinates43.03976, -71.12189
Functional classUrban Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionOctober 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating33.1 US tons
Inventory rating22.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length41 ft (12.5 m)
Longest span34 ft (10.4 m)
Deck width23 ft (6.9 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic568 (2023)
Projected traffic840 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Blake Road over Lamprey River built?

It was built in 1952, making it 73 years old in 2025.

What condition is Blake Road over Lamprey River 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 October 2024.

How much traffic does Blake Road over Lamprey River carry?

About 568 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Blake Road over Lamprey River?

The structure is 41 ft (12.5 m) long with a longest span of 34 ft (10.4 m) and a deck 23 ft wide.

Who owns Blake Road over Lamprey River?

It is owned by the City or Municipal Highway Agency.