US Bridges

Mt. Pleasant Tpk. over Den Brook

Fair

Morris County, New Jersey · 2.5MI NW of NJ10&NJ53 JCT · Structure no. 1400917

Built
1925
100 years old, rebuilt 2010
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
25 ft
1 main span
Daily traffic
1,072
2023 count
Owner
County
County Highway Agency

About this bridge

Mt. Pleasant Tpk. over Den Brook is a steel stringer/multi-beam or girder carrying Mt. Pleasant Tpk. over Den Brook in Morris County, New Jersey. It was built in 1925 and reconstructed in 2010, so it is 100 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 1,072 vehicles a day, roughly 1% of them trucks, projected to reach 1,308 by 2043. The structure is 25 ft (7.6 m) long and 18 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMt. Pleasant Tpk.
CrossesDen Brook
Location2.5MI NW of NJ10&NJ53 JCT
RouteCity Street 0
CountyMorris County
StateNew Jersey
Coordinates40.86847, -74.51726
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating110.1 US tons
Inventory rating75.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span21 ft (6.4 m)
Deck width18 ft (5.4 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,072 (2023)
Projected traffic1,308 by 2043
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-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$353,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mt. Pleasant Tpk. over Den Brook built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 2010.

What condition is Mt. Pleasant Tpk. over Den 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 Mt. Pleasant Tpk. over Den Brook carry?

About 1,072 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Mt. Pleasant Tpk. over Den Brook?

The structure is 25 ft (7.6 m) long with a longest span of 21 ft (6.4 m) and a deck 18 ft wide.

Who owns Mt. Pleasant Tpk. over Den Brook?

It is owned by the County Highway Agency.