US Bridges

Tyler Road over Blackwater River

Fair

Merrimack County, New Hampshire · 3.0 MI N of Hopkinton Tl · Structure no. 026801110008100

Built
1951
74 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
275
2023 count
Owner
State
State Highway Agency

About this bridge

Tyler Road over Blackwater River is a steel stringer/multi-beam or girder carrying Tyler Road over Blackwater River in Merrimack County, New Hampshire. It was built in 1951, so it is 74 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 6 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 275 vehicles a day, roughly 4% of them trucks, projected to reach 407 by 2043. The structure is 60 ft (18.3 m) long and 27 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesTyler Road
CrossesBlackwater River
Location3.0 MI N of Hopkinton Tl
RouteState Highway 0
CountyMerrimack County
StateNew Hampshire
Coordinates43.28712, -71.71037
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.9 US tons
Inventory rating22 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length60 ft (18.3 m)
Longest span55 ft (16.8 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic275 (2023)
Projected traffic407 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Tyler Road over Blackwater River built?

It was built in 1951, making it 74 years old in 2025.

What condition is Tyler Road over Blackwater 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 May 2024.

How much traffic does Tyler Road over Blackwater River carry?

About 275 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Tyler Road over Blackwater River?

The structure is 60 ft (18.3 m) long with a longest span of 55 ft (16.8 m) and a deck 27 ft wide.

Who owns Tyler Road over Blackwater River?

It is owned by the State Highway Agency.