The League to Save Lake Tahoe and the Tahoe Area Sierra Club filed a request last week for a preliminary injunction that would block new projects until an environmental review of a shoreline development plan by the Tahoe Regional Planning Agency is completed.
U.S. District Judge Lawrence Karlton is scheduled to hold a hearing on the request in Sacramento on Aug. 3.
The groups claim new boating facilities will increase water and air pollution and could increase the chances of quagga mussels entering the lake.
If granted, the injunction would be issued in connection with a lawsuit the groups filed in November.
Rochelle Nason, executive director of the League to Save Lake Tahoe, said, "This is no time to be adding more buoys and piers and ramps along the shore of the lake."
"Lake Tahoe is still very much in jeopardy of losing its famed clarity," Nason said.