US Bridges

Cascade Flats over Tinker Brook

Good

Coos County, New Hampshire · 2 10th M. FR NH16 S. End · Structure no. 009700860017500

Built
2018
7 years old
Condition
Good
inspected April 2024
Type
Culvert
Concrete
Length
23 ft
1 main span
Daily traffic
510
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Cascade Flats over Tinker Brook is a concrete culvert carrying Cascade Flats over Tinker Brook in Coos County, New Hampshire. It was built in 2018, so it is 7 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 510 vehicles a day, projected to reach 754 by 2043. The structure is 23 ft (7 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesCascade Flats
CrossesTinker Brook
Location2 10th M. FR NH16 S. End
RouteCity Street _0000
Coordinates44.43796, -71.19005
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating56.5 US tons
Inventory rating43.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length23 ft (7 m)
Longest span20 ft (6.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic510 (2023)
Projected traffic754 by 2043
Trucks—
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 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 Cascade Flats over Tinker Brook built?

It was built in 2018, making it 7 years old in 2025.

What condition is Cascade Flats over Tinker Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does Cascade Flats over Tinker Brook carry?

About 510 vehicles per day (2023 count).

How long is Cascade Flats over Tinker Brook?

The structure is 23 ft (7 m) long with a longest span of 20 ft (6.2 m).

Who owns Cascade Flats over Tinker Brook?

It is owned by the City or Municipal Highway Agency.