Placer County supervisors have given final approval to a major development in the Martis Valley between Truckee and North Lake Tahoe.
And groups opposing the subdivision say they are headed to court to continue their fight.
The Martis Valley Community Plan update calls for more than 6,000 new housing units, malls and other commercial development and the widening of California 267 from two lanes to four.
Sierra Watch, the League to Save Lake Tahoe and Mountain Area Preservation Foundation now have 30 days to file a complaint.
"Today's vote is more like the starting gun than the finish line," Sierra Watch executive director Tom Mooers said on Tuesday.
The opposing groups contend the development poses a threat to Lake Tahoe and developers haven't adequately reviewed the impact on traffic, wildlife habitat and air quality.
Proponents call the long-term blueprint for change a reasonable strategy for an area where growth has long been envisioned.
They say the plan is a rewrite of a 1975 growth strategy that would have allowed significantly more development with as many as 12,000 homes.