on the grounds of our seven-acre tract, Nathan Hofheimer had this grotto built in 1915, over a 165 foot deep copper mine that had been flooding. It is one of the most beautiful man-made grottos in the East and some say it was modeled after a similar grotto in Germany that Mr. Hofheimer saw during his travels abroad, constructed with the help of European craftsmen. The grotto lies at one end of the Hofheimer Woods trail, maintained by Warren Township.
is 18 feet deep and its waters flow over a damn to connect further down with the East Branch Middle Brook (that later becomes Buttermilk Falls after the East Branch Reservoir).
was supplied by the nameless pond on the edge of the Warrenbrook Golf Course and flowed over and down the multiple tiers of stone layered around the pool. Sadly, on June 1, 1966 Somerset County got permission to pump 100,000 gallons a day from this pond for the watering of the Warrenbrook Golf course and closed this valve, thus ending the dreams that the Elks had of making this grotto, once again, a beautiful showplace for Warren Township. The adjoining pond just North of the grotto, part of the East Branch Middle Brook, dried up.
Near 2005, there were discussions to install pumps to create a fountain that would aerate the stagnant water, but there doesn’t appear to be any proof that this ever happened.
Today, the grotto is overgrown, with a trickle of spring-fed water falling over the dam. The adjacent pool to the north is now a swamp, unable to receive any water as overflow from the pond and grotto.
Grotto Plans Down the Drain – Elks Club in Quandary as Pumping Drops Pool Level
There’s copper (and gold and silver, too) in them thar hills
Warren Township’s hidden wonder: The mysterious Hofheimer Grotto
Warren takes the first step to restore power at Hofheimer Grotto
GPS Location: 40°36’56″N 74°29’28″W
Nearby Parking Lot with Public Access Trail: 99 Bardy Rd, Warren, NJ, 07059