2009 Waterbird Survey
The number of waterbirds on the pools within the survey area is monitored to determine population sizes, habitat usage, and the waterfowl's response to management actions. Survey flights ran weekly through the autumn migration, weather premitting. In 2009, the flights covered Pool 2 (backed up by Lock and Dam 2 at Hastings, MN) to Pool 14 (backed up by Lock and Dam 14 at LeClaire, IA). (Map)
Waterbirds Start to Arrive in September
And they arrived suddenly. Pool 9 lies on the river at the Minnesota and Iowa border and has excellent diving duck habitat. Diving ducks included redhead, canvasback, ringneck, scaup, goldeneye, bufflehead, merganser and ruddy ducks. Pool 9 contained no diving ducks on September 30 and only twenty on October 5. A week later that number had increased to 22,655 diving ducks and by October 20 that number had burgeoned to 98,700.
Tracking the Migration
This is the first year the survey included the reach of the Mississippi River between St. Paul and Lake Pepin, but the USFWS website does contain links to data from previous years for the area from Wabasha to Rock Island.Waterbird Usage Indicates Habitat Quality
Data for the reach of the river above Lake Pepin is sparse and doesn't tell us much yet, but it appears duck numbers are significantly higher downriver of Lake Pepin. This may be due in part to the presence of better habitat. On October 20, 2009, Pool 5 contained 8,900 diving ducks and Pool 6 contained 13,600 diving ducks. Pool 5A, which sits between Pools 5 and 6 contained only 50 diving ducks.
Did You Know?
At Lake Onalaska, near LaCrosse WI, the Mississippi River is about 4 miles wide. The combination of water held behind Lock and Dam #7 and water held by damming the Black River form this broad reach of the Mississippi River.