I birded both these parks from 6:30 to 10:00 with good results.  18 species of warblers: Yellow-rumped: 32; American Redstart: 10; Black-throated Blue: 10; Nashville: 5; Northern Parula 5; Nashville Warbler: 5; Chestnut-sided: 5; Blackburnian: 4; Black-throated Green: 3; singles of Palm, Ovenbird, Northern Waterthrush; Common Yellowthroat; Pine; Black-and-White; Blue-winged, Magnolia and Hooded.  A good variety of vireos: Blue-headed, Warblind and Red-eyed.
The female Hooded Warbler was feeding low along Sheridan creek at the base of the first bridge upstream from the marsh.  The male Blue-winged Warbler was feeding high in large willow on the Meadow trail.  Other notable records: 1 Orchard Oriole (Jack Darling Park west parking lot); 1 Green Heron; 1 Virginia Rail (within 20 feet of south boardwalk look over marsh/seen and heard at 6:45 am); Eastern Screech-Owl (in opening of Wood Duck nest box on edge of upper marsh).  Also one Eastern Wood-Peewee.  All the warblers were quite spread out ... I about 80% of the trails.  A large log has jammed across the outflow of Sheridan Creek so the water level in marsh is higher than they have been all spring, re-flooding most areas of marsh. 
I managed to get over Col. Sam. Smith park to find the Canada Warbler found in the bowl in the morning by several birders.

I birded both these parks from 6:30 to 10:00 with good results. 18 species of warblers: Yellow-rumped: 32; American Redstart: 10; Black-throated Blue: 10; Nashville: 5; Northern Parula 5; Nashville Warbler: 5; Chestnut-sided: 5; Blackburnian: 4; Black-throated Green: 3; singles of Palm, Ovenbird, Northern Waterthrush; Common Yellowthroat; Pine; Black-and-White; Blue-winged, Magnolia and Hooded. A good variety of vireos: Blue-headed, Warblind and Red-eyed. The female Hooded Warbler was feeding low along Sheridan creek at the base of the first bridge upstream from the marsh. The male Blue-winged Warbler was feeding high in large willow on the Meadow trail. Other notable records: 1 Orchard Oriole (Jack Darling Park west parking lot); 1 Green Heron; 1 Virginia Rail (within 20 feet of south boardwalk look over marsh/seen and heard at 6:45 am); Eastern Screech-Owl (in opening of Wood Duck nest box on edge of upper marsh). Also one Eastern Wood-Peewee. All the warblers were quite spread out ... I about 80% of the trails. A large log has jammed across the outflow of Sheridan Creek so the water level in marsh is higher than they have been all spring, re-flooding most areas of marsh. I managed to get over Col. Sam. Smith park to find the Canada Warbler found in the bowl in the morning by several birders. Directions: Rattray Marsh: park at bottom of Bexhill Road of Lakeshore Boulevard west between Erin Mills Parkway and Mississauga Road. Jack Darling Park is located immediately east of the Rattray Marsh C.A. and the entrance is clearly marked on Lakeshore. Proceed to the parking lot at end of the road. Wayne Renaud (289-828-0043)