The water main break was reported on Sunday afternoon with repairs and road closures continuing into Monday.
The railroad crossing gates were stuck down on Wednesday morning.
The highway has since been reopened as of 1:41 p.m. Tuesday, Montgomery police said.
Westbound Amwell Road reopened around 9 p.m. after being closed for about 4 hours on Thursday.
Drivers should never drive into flooded roadways.
A tree came down on the highway toppling wires in Hillsborough on Wednesday during the storm.
Hillsborough Police sent out an alert stating the highway reopened just before 3:30 p.m. Tuesday.
Hollow Road in Montgomery was temporarily closed on Wednesday.
Drivers should avoid the area, plan an alternate route and expect delays.
The causeway had closed on Wednesday due to heavy rain.
Currently, the Millstone River is at 9.84 feet high, just below the 10-foot marker for minor flooding in Montgomery.
Two roadways in Hillsborough will be closed for most of the day Tuesday for utility work.
The $41 million federally-funded project to widen Route 206 will create two travel lanes in each direction from Doctors Way and Valley Road.
The highway in Montgomery is closed on Monday afternoon as a result. The National Weather Service issued a wind advisory through 3 p.m.
Multiple roadways in Montgomery are closed Friday due to flooding, Somerset County Public Safety announced.
Here's where construction will be taking place over the next few weeks:
Somerset County is still working to cleanup downed trees and wires following Tropical Storm Isaias.
If you are heading out, make sure to check out this list of Somerset County roads that are closed:
Roads are beginning to close as a result of Tropical Storm Fay hitting the area on Friday.
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The construction will cause a segment of Belle Mead-Blawenburg Road to be fully closed to vehicular, bicycle and pedestrian traffic.
With the funding Brown Avenue will be extended to connect to Route 206 in Hillsborough.
This traffic shift will move drivers to the right onto the newly constructed roadway allowing the jug handle from Route 206 to open.
Great Road (County Route 601) in Montgomery had been closed for two months for bridge repairs.
The roadway from south of Georgetown Franklin Turnpike (County Route 518) and north of Cherry Valley Road will reopen for the holiday break.
The money is part of more than $161 million in grants that will help advance road, bridge, safety, and quality-of-life improvements.
Drivers should find another route and avoid the area.
Construction is scheduled to begin on Monday and continue through the end of January 2020.
Downed poles and wires continue to be reported throughout out Hillsborough and Montgomery causing road closures Friday morning.
Sections of Canal Road will be closed next week for work related to the D&R Canal dredging project
Hillsborough residents are being asked to fill out a survey to figure how many would be interested in having an express weekend bus to NYC.
Old Somerville Road will be permanently closed beginning Saturday to allow for the construction of a ramp from the Route 206 Bypass.
The lane shift, which is part of the Route 206 Bypass project, is expected to last through the winter.
Paving work is scheduled to take place on two Hillsborough roadways Monday, Sept. 9.
Overnight lane closures are expected Thursday ahead of the opening of the new jughandle, which will eliminate left turns to Triangle Road.
A traffic light at the intersection of Route 206 and County Route 601 has been repaired Friday morning, Montgomery Police said.
Cherry Valley Road has reopened late Tuesday night following downed wires, police report.
River Road in Hillsborough has reopened following a downed pole on Thursday morning.
Flooding and downed wires and trees caused the roadway to close on Tuesday.
Gas prices are always changing. Here's the latest on the cheapest gas in Hillsborough.