I also found this…who knows which elevation is truly correct…but at least you know where Rosemarie Meadows is…
Below is from Winnetts book on JMT
The JMT fords Bear Creek (difficult in early season); beyond here, the grade increases to a moderate climb to the foot of charming Rosemarie Meadow (10,010 - 1.4), where the trail fords West Fork Bear Creek ¬avoid a use trail westward on the creek’s north bank. In 200 more yards you meet a trail that departs east for Three Island Lake, on the way to which you’ll find Lou Beverly Lake, and in another quarter mile you’ll find a trail that climbs southwest to Rose Lake. Both Rose and Lou Beverly lakes provide good, secluded camping. Nearer the JMT, there are campsites in the slabs just above Rosmarie Meadow.
AlohaTink