US Bridges

Blue Mill Road over Great Brook

Fair

Morris County, New Jersey · 1.6 MI E CR646&CR663 JCT · Structure no. 1400488

Built
1919
106 years old, rebuilt 1995
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
33 ft
1 main span
Daily traffic
4,968
2023 count
Owner
County
County Highway Agency

About this bridge

Blue Mill Road over Great Brook is a prestressed concrete box beam or girders - multiple carrying Blue Mill Road over Great Brook in Morris County, New Jersey. It was built in 1919 and reconstructed in 1995, so it is 106 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 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 4,968 vehicles a day, roughly 3% of them trucks, projected to reach 6,061 by 2043. The structure is 33 ft (10.1 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesBlue Mill Road
CrossesGreat Brook
Location1.6 MI E CR646&CR663 JCT
RouteCity Street 0
CountyMorris County
StateNew Jersey
Coordinates40.74942, -74.46557
Functional classUrban Collector

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating63.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width26 ft (8 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,968 (2023)
Projected traffic6,061 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$315,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Blue Mill Road over Great Brook built?

It was built in 1919, making it 106 years old in 2025. It was reconstructed in 1995.

What condition is Blue Mill Road over Great 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 June 2023.

How much traffic does Blue Mill Road over Great Brook carry?

About 4,968 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Blue Mill Road over Great Brook?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 26 ft wide.

Who owns Blue Mill Road over Great Brook?

It is owned by the County Highway Agency.