US Bridges

Mount Pleasant Ave over Stony Brook

Fair

Morris County, New Jersey · 0.08M SW CR511 & NJ10 JCT · Structure no. 1400385

Built
1917
108 years old
Condition
Fair
inspected July 2023
Type
Arch - Deck
Masonry
Length
21 ft
1 main span
Daily traffic
2,422
2023 count
Owner
County
County Highway Agency

About this bridge

Mount Pleasant Ave over Stony Brook is a masonry arch - deck carrying Mount Pleasant Ave over Stony Brook in Morris County, New Jersey. It was built in 1917, so it is 108 years old, older than the New Jersey average of 58.5 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 2,422 vehicles a day, roughly 1% of them trucks, projected to reach 2,954 by 2043. The structure is 21 ft (6.4 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMount Pleasant Ave
CrossesStony Brook
Location0.08M SW CR511 & NJ10 JCT
RouteCity Street 0
CountyMorris County
StateNew Jersey
Coordinates40.82388, -74.4194
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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating49.1 US tons
Inventory rating29 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadH 20
Structure length21 ft (6.4 m)
Longest span21 ft (6.4 m)
Deck width29 ft (8.8 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,422 (2023)
Projected traffic2,954 by 2043
Trucks1%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$130,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mount Pleasant Ave over Stony Brook built?

It was built in 1917, making it 108 years old in 2025.

What condition is Mount Pleasant Ave over Stony 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 July 2023.

How much traffic does Mount Pleasant Ave over Stony Brook carry?

About 2,422 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Mount Pleasant Ave over Stony Brook?

The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m) and a deck 29 ft wide.

Who owns Mount Pleasant Ave over Stony Brook?

It is owned by the County Highway Agency.