By Tim Jimenez

TRENTON (CBS) — An ice jam on the Delaware River in Trenton is pushing water up over the banks and onto a roadway.

The cold temperatures are also causing that water to freeze.

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The river looks like a sea of ice as recent warm temperatures and rain led to ice breaking up and flowing down the river.

A portion of Route 29 has reopened to traffic after all lanes were closed since Monday morning due to flooding. The off-ramp to Memorial Drive remains closed.

The ice jams on the Delaware River caused water levels to rise above 20 feet, which caused minor flooding in Trenton.

“It’s pretty cool, it’s pretty impressive,” said Roger Shapiro of Ewing. “It’s like a big glacier or something.”

Many came out to get a glimpse and take pictures of the rare sighting for themselves.

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“It’s crazy, it’s almost as crazy as 1995,” said Bill Denton. “There were big chunks out on the road on the Pennsylvania side as big as vans… It’s pretty amazing.”

A boil water advisory has been issued for customers of Trenton Water Works.

“Trenton Water Works is providing notification that high turbidity from recent weather has resulted in a treatment plant malfunction and the potential for inadequately disinfected water in the vicinity into the City from the Delaware River to Prospect Street and Bellevue Avenue to Prospect Street to Pennington Avenue to Perry Street to South Clinton Avenue to Liberty Street to Duck Island,”

Flooding was also reported by the river between Morrisville and Yardley in Pennsylvania.

“Historically, we have had issues on these roads when icing and flooding happen,” said Bucks County spokesman Chris Edwards. “There are some issues along East Ferry and River Road.”

Water is expected to recede, but that will happen much slower.

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Minor flooding could continue until mid-morning on Tuesday.