Riverlands Migratory Bird Sanctuary - highlights:

American Bittern (Pintail Marsh area)
Sora (First channel on the right heading east as you pass the gate on Riverlands Way)

Columbia Bottom Conservation Area - highlights:

Little Blue Heron (FOS for me)
Long-billed Dowitchers- 3  (mixed in with the Greater and Lesser Yellowlegs, Wilson's Snipe, Red-breasted Mergansers, Pectoral Sandpipers, etc. in ponds off the gravel road)
Northern Rough-winged Swallow

Little Creve Coeur - highlights:

Sora - saw 9, heard at least 5 others coming from behind us (with at least two Swamp Sparrows for every Sora)
Yellow Rail! 
Solitary Sandpipers - 2
Fish Crows - 2

Andy Reago
St. Louis MO
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The Audubon Society of Missouri's Wild Bird Discussion Forum
ASM Spring Meeting: April 27, 2012 in Joplin, MO
ABA Birding Code of Ethics