The only FAA-approved ice runway in the lower 48 states is open for business in a cove of New Hampshire's Lake Winnipesaukee

Conditions at the Alton Bay Seaplane Base ice runway are described Tuesday as good, although "a little bumpy in spots."

[2018 Report: Landing on Ice - The Alton Bay Ice Runway is Open]

The runway is 100 feet wide, 2,730 feet long, and 50 feet wide.

The bay is a public-use seaplane base in the summer and a plowed ice runway in the winter. The ice runway attracts several hundred pilots during the winter season.