US Bridges

US 206 over Big Flat Brook

Poor

Sussex County, New Jersey · 0.61 MI N of CR 560 · Structure no. 1912160

Built
1929
96 years old, rebuilt 2010
Condition
Poor
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
93 ft
2 main spans
Daily traffic
16,806
2023 count
Owner
State
State Highway Agency

About this bridge

US 206 over Big Flat Brook is a steel stringer/multi-beam or girder carrying US 206 over Big Flat Brook in Sussex County, New Jersey. It was built in 1929 and reconstructed in 2010, so it is 96 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 16,806 vehicles a day, roughly 7% of them trucks, projected to reach 20,504 by 2043. The structure is 93 ft (28.3 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 206
CrossesBig Flat Brook
Location0.61 MI N of CR 560
RouteU.S. Route 206
Coordinates41.20683, -74.80347
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length93 ft (28.3 m)
Longest span43 ft (13.1 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,806 (2023)
Projected traffic20,504 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$288,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 206 over Big Flat Brook built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 2010.

What condition is US 206 over Big Flat Brook in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does US 206 over Big Flat Brook carry?

About 16,806 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 206 over Big Flat Brook?

The structure is 93 ft (28.3 m) long with a longest span of 43 ft (13.1 m) and a deck 44 ft wide.

Who owns US 206 over Big Flat Brook?

It is owned by the State Highway Agency.