There are two storm water ponds off 6th Line just south of Dundas in Oakville. One pond is directly in front of the Wellspring Centre.
In that particular pond today were
-3 cormorants
-1 male and 2 female blue winged teal
-2 pairs of ring necked ducks
-the usual suspects: red winged black birds m and f; mourning doves; killdeer; mallards; Canada Geese; robins; grackles; starlings
In the second pond (closer to Walmart), there were 2 terns steadily fishing. I'm no expert, so I'll post a photo below, but they were huge and I believe they were Caspian terns. Noisy too.
I asked a fisher what fish were in the ponds, as they are landlocked. He said they had been stocked with at least bass and crappie.
If you want to double check the location, you can enter the following on Google Maps to pull up the view:
Wellspring Centre, Sixth Line, Oakville, ON
There is quite a bit of free parking along Central Park drive during the business day.