Michigan’s Great Lakes Research Fleet

Research Vessel “Chinook”, Lake Huron Research Vessel “Steelhead”, Lake Michigan

Research Vessel “Channel Cat”, Lake Erie Research Vessel “Judy”, Lake Superior

Zebra and quagga mussels have fundamentally changed

the ecology of the Great Lakes

Dams prevent Great Lakes fish from reaching traditionalspawning sites in tributaries. Thus, trout and salmon fisheriesin lakes Huron and Michigan must be supported by stocking.

Legend

Connected

Unconnected

:

0 30 6015 Kilometers

Lake Huron Tributary Connectivity

Lake Huronstreams still assessable to

Great Lakes fish for spawning:

The streams shown in blue are still assessable

Streams shown in red are blocked by dams

Only the colder streams are suitable for trout and salmon;

of these, only 3% remain assessable.

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DOW

Chesaning

Mt. Pleasant (Harris) St Louis

State StreetHamilton

Mott

Holloway

Frankenmuth

Caro (Edison)

Sanford

EdenvilleBeaverton

Smallwood

Secord

Lake Isabella

Saginaw River system and major dams: Only streams shown in yellow are accessible to walleyes and sturgeon for spawning

Alewife littered beachesDuring the 1960sLake Michigan