From an Inyo NF page:
Camping is allowed outside of designated campgrounds in some areas on the Inyo National Forest. In areas designated as "Developed Recreation Areas," camping is restricted to developed campgrounds only. These areas include the Mono Basin National Forest Scenic Area, Lundy Canyon, Lee Vining Canyon, June Lake Loop, the Mammoth area, Reds Meadow area, Convict Lake, McGee Creek canyon, Rock Creek Canyon, Bishop Creek Canyon, Big Pine Canyon, Onion Valley, Whitney Portal, Horseshoe Meadows, the Ancient Bristlecone Pine Forest and any Research Natural Area. For more information, please contact the Ranger Station or Visitor Center nearest the area in which you are interested.
For areas where dispersed camping is allowed, you need to obtain a California Campfire Permit for the use of any open flame (including gas stoves, lanterns, wood fires, charcoal fires or smoking). These permits can be obtained at no cost from any Inyo National Forest Ranger Station or Visitor Center. Open flame of any kind may be restricted during times of high fire danger; check with the local Forest Service office for current restrictions.
--------------------------
Better to stay someplace free for a few hours that is down low, dry, without mosquitoes. You can park almost anywhere on BLM lands and many places in the national forest outside those noted above. Since you don't have a paper copy for Inyo NF which would show all the boundaries of wherer you can and cannot camp, do the following.
Go to this page and download the June Lake and Mono Lake pdf's.
http://www.fs.fed.us/r5/inyo/projects/mvum.shtmlGo to this topo map page which is at the junction of US395 and SR120 south of Lee Vining.
http://mapper.acme.com/?ll=37.88945,-119.09437&z=15&t=TYou just need a place to park, a flat spot toss bags out, and sleep till dawn. At the US395 and SR120 junction go east and after driving about a couple miles, slow down and take any of the obscure dirt roads (except the one at 6591 that goes to South Tufa) until 100 feet off the paved highway. Get out with flash light and find an open flat spot in the sagebrush that ought be easy. Be sure to print out the map areas where you will be looking for the dirt roads. The topo map is obviously more detailed.