US Bridges

Old Nj 27 over Millstone River

PoorPosted for load

Mercer County, New Jersey · 0.25 MI S of CR 614 · Structure no. 1105151

Built
1798
227 years old
Condition
Poor
inspected June 2023
Type
Arch - Deck
Masonry
Length
110 ft
4 main spans
Daily traffic
24
2023 count
Owner
State
State Highway Agency

About this bridge

Old Nj 27 over Millstone River is a masonry arch - deck carrying Old Nj 27 over Millstone River in Mercer County, New Jersey. It was built in 1798, so it is 227 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 3 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. Its operating status is: posted for load restriction.

It carries about 24 vehicles a day, projected to reach 29 by 2043. The structure is 110 ft (33.5 m) long and 27 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesOld Nj 27
CrossesMillstone River
Location0.25 MI S of CR 614
RouteState Lands Road 0
CountyMercer County
StateNew Jersey
Coordinates40.37374, -74.62045
Functional classUrban Local

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
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
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 statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating33 US tons
Inventory rating20 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans4
Design loadUnknown
Structure length110 ft (33.5 m)
Longest span20 ft (6.1 m)
Deck width27 ft (8.1 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24 (2023)
Projected traffic29 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$276,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Nj 27 over Millstone River built?

It was built in 1798, making it 227 years old in 2025.

What condition is Old Nj 27 over Millstone River 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 June 2023.

How much traffic does Old Nj 27 over Millstone River carry?

About 24 vehicles per day (2023 count).

How long is Old Nj 27 over Millstone River?

The structure is 110 ft (33.5 m) long with a longest span of 20 ft (6.1 m) and a deck 27 ft wide.

Who owns Old Nj 27 over Millstone River?

It is owned by the State Highway Agency.