& 

i myself have found

tho there may be some slight uncertainty as to where the reservation boundary actually lies on the california side of the river 

for just a couple of miles between nlat33d57m53s & nlat33d55m20s 

where there may have been both an avulsion & accretions

& which may involve the tiny northernmost triangle & sliver of the supposedly disputed lands shown in dark brown on the map accompanying the news articles 

or say no more than 5 percent of all these lands

nevertheless 

usgs topos clearly show that the reservation boundary is otherwise fully surveyed in both states & even monumented with mile markers & not at all riverine in those areas

for example as shown in dashed lines on both sides of the river here http://www.mytopo.com/maps/?lat=33.8706&lon=-114.4260&z=12

so the thrust of the news story does not really involve the river channel at all

oops

let alone the middle of the channel