Are they in Yellowstone?
The University of Utah web site lists all three in the Yellowstone "Region". Looking at a map of seismographs the "region" only extents about 10 miles outside Yellowstone Park in all directions.
Map at http://www.quake.utah.edu/helicorder/yell_webi.htm (locations are coded)
The seismograph for Yellowstone Lake can be found at http://www.quake.utah.edu/helicorder/lkwy_webi.htm