US Bridges

Old Mill Road over Burnett Brook

Fair

Morris County, New Jersey · .6 M of County RTE 510 · Structure no. 1400724

Built
1910
115 years old, rebuilt 1992
Condition
Fair
inspected June 2023
Type
Truss - Thru
Steel
Length
55 ft
1 main span
Daily traffic
3,855
2023 count
Owner
County
County Highway Agency

About this bridge

Old Mill Road over Burnett Brook is a steel truss - thru carrying Old Mill Road over Burnett Brook in Morris County, New Jersey. It was built in 1910 and reconstructed in 1992, so it is 115 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 3,855 vehicles a day, roughly 3% of them trucks, projected to reach 4,704 by 2043. The structure is 55 ft (16.8 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesOld Mill Road
CrossesBurnett Brook
Location.6 M of County RTE 510
RouteCity Street 0
CountyMorris County
StateNew Jersey
Coordinates40.78252, -74.64516
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length55 ft (16.8 m)
Longest span51 ft (15.5 m)
Deck width24 ft (7.2 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,855 (2023)
Projected traffic4,704 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.7 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Mill Road over Burnett Brook built?

It was built in 1910, making it 115 years old in 2025. It was reconstructed in 1992.

What condition is Old Mill Road over Burnett 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 Old Mill Road over Burnett Brook carry?

About 3,855 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Old Mill Road over Burnett Brook?

The structure is 55 ft (16.8 m) long with a longest span of 51 ft (15.5 m) and a deck 24 ft wide.

Who owns Old Mill Road over Burnett Brook?

It is owned by the County Highway Agency.