3 Dams and River Ecology - Iowa Department of Natural Resources

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Fig. 5-5 Dams Likely to Slow Upstream Infestation of Silver / Big Head Carp Big Sioux River XW XWXWXWXWXW Floyd River XW XW Legend &- Asian Carp Barrier Structures XW Figure 3-e. Dams likely to slow upstream infestation of silver and big head carp. XWXW XW Rock River XW XW XW XW XW Missouri River West Fork Little Sioux River XW Known upstream extent of Big Head Carp Known upstream extent of Silver Carp Fish segments Fish barrier Major Lakes County Boundary XW XW Soldier River Willow Creek XW Boyer River XW Keg Creek XW XWXW XW XW XW XW XW XW XW Silver Creek XW Silver Creek Ocheyedan River Little Sioux River West Nishnabotna River Walnut Creek XW XW XW XW XW XW XW XW XW XW XW XW Spirit Lake Outlet XW XW XW XW XW XW XW XW XW XW Lake Okoboji Outlet &- XW XW XW &- Nodaway River &- Linn Grove Dam XW XW XW West Fork Des Moines River XW XWXW XWXW XW XW XW XW XW XW XWXWXW XW XW XW North River XW XW XW XW XW XW XW North Raccoon River XW Boone River XWXW XW XW XW XW XW &- XW XW XWXW Middle River XW XW XW XW XW XWXW XWXWXWXWXW XW XW XW XW South Skunk River Saylorville Dam XW Des Moines River 38 Iowa River XW XW XWXW XW XW XW XW XW X XW XW XW &- - Red Rock Dam XW XW &- XW XW XW XW XW XWXW XW XW XW XW XW XW XW XW XW XWXW XW XW XW XW XWXW XW XW Crane Creek XW XW XW XW XW XW XWXW XW XWXW XW XW XW XW XW XW XW XW XW XWXW XW XW XW XWXW XW XW XW XW XW XW XW XW XW Beaver Creek Lytle Creek Iowa River Rathbun Dam Chariton River Turkey River Upper Dam &-&- English River Big Cedar Creek Upper Iowa River Lower Dam Volga River &- Coralville Dam Skunk River Des Moines River Yellow River Elkader Big Dam XW XW 5-in-1 Bridge & Dam &- &- &- &- Cedar River Oakland Mills Dam XW &- Mississippi Lock and Dam 9 XW Anamosa Dam XW W XW XW XW XW X &- XW XW WX Lakehurst Dam Maquoketa River Wapsipinicon River XWXWXW WXW X XW WX &- WX Mississippi Lock and Dam 15
XW XW XW XW Excessive zebra mussel colonization of native mussels can lead to mortality among native mussels. However, unlike native mussels which colonize upriver by using fish hosts, exotic zebra mussels produce immense quantities of young, waterbourne zebra mussels called “veligers” that can quickly spread throughout lakes and impoundments. These veligers can also drift down rivers. Swifter water may help destroy the veligers as they move downstream, while impoundments provide locations where it is more likely veligers may drop out of the water column and begin colonies. XW XW Elk Creek XW XW XW XW XW XWXWXWXWXW XW XW XW XW XW XW XW XW XW XW XW Rock Creek XWXW XW XW XW XW XW XW XW XWXW XW XW Beaver Creek XW XW XW XW XW Little Wapsipinicon River XWXW XW XW XW XWXW XW XW XW XW Crane Creek XW XW XW XW XWXW XW XW XWXW XW XW XW XW XW XW XW XW XW XW XW XW XW XWXW XW XW Currently in the interior of Iowa, zebra mussels are known to infest one natural lake, Clear Lake, and one river impoundment, Lake Delhi. Water from Clear Lake feeds Willow Creek, which flows into the Winnebago River, which flows into the Shell Rock River, which flows into the Cedar River and eventually the Iowa. Because Willow Creek and the Winnebago River are naturally rapids streams, it may be that removal of several unused dams, if there is little social value to the dams, could have positive benefits on slowing the downriver spread of zebra mussels. Fig. 5-6 River Segments to Monitor For Dowstream Spread of Zebra Mussel Iowa River Wor-1 Legend XW XW Figure 3-f examines impoundments downstream of the two zebra-mussel infested waters in Iowa’s interior, for potential overlapping priorities. Where dam projects otherwise have movements, removal will be encouraged as a preferred option to potentially reduce downstream spread of zebra mussels. Har-1 Willow Creek Shell Rock River Winnebago River Har-2 Fish barrier Wor-2 Beaverdam Creek Fra-3 Fra-1 Fra-2 Cer-5 Cer-19 Cer-9 Cer-10 South Fork Iowa River Iowa River Hartgrave Creek Har-3 Flo-3 Mit-2 Mit-5 Cedar River Mit-8 Flo-6 Black Hawk Creek Cedar River Shell Rock River Impoundments likely to be colonized by zebra mussels Mississippi Lock & Dams Fish segments Major Lakes County Boundary Mit-3 Mit-7 Flo-4 Mit-4 Flo-5 But-1 Mit-1 But-5 Gru-3 Flo-1 But-3 Flo-2 But-4 How-2 Chi-2 Chi-3 Cedar River How-6 Bre-2 Bla-1 Bla-2 Bla-5 Crane Creek Crane Creek Chi-4 Bla-3 Chi-1 Bla-4 Bre-1 How-3 How-1 How-4 Fay-9 Buc-1 Buc-2 Otter Creek Win-3 Fay-8 Fay-2 Fay-7 Buc-6 Buc-4 Buc-3 Cedar River Win-2 Win-1 Buc-5 Volga River Buffalo Creek Wapsipinicon River Lin-5 Fay-4 Lin-3 Del-1 Del-2 Lin-7 Lin-6 Cly-1 Del-3 Upper Iowa River Yellow River Cly-2 Del-4 Buffalo Creek Del-5 XW Jon-1 XW XW XW XW Turkey River All-1 All-1 Jon-3 Cly-4 Turkey River XW Dub-2 Wapsipinicon River Maquoketa River XW Jon-2 XW Cer-19 Lytle Creek Jac-3 XW XW XW XW XW Dub-3 Jac-1 Jac-2 Willow Creek Maquoketa River Jac-4 XW Cer-9 XW XW Cer-11 XW Cer-8 Winnebago River XW XW XW Cer-5 Cer-6 Cer-7 Cer-18 Cer-13 Willow Creek Dams to Confluence 39 Legend XW XW Fish barrier Fish segments Major Lakes County Boundary Lake Delhi was an impoundment on the Maquoketa River that was heavily infested with zebra mussels prior to its breach in 2010 (see image below). A dam directly downstream, Mon-Maq Dam, is currently undergoing alternative analysis in a community effort, due to flooding problems that may in part be caused by the dam and an associated dike. While it is unlikely the zebra mussel issue will become a primary local driver to drive outcomes such as thes dams, considering ways to slow the speared of zebra mussels should be considered. Actions 1) Where dams with little remaining social value coincide with zebra mussel priorities, high biological priority shall be given to removal of structures and restoration of free-flowing water. 2) Collaborations among USFWS, DNR aquatic invansive species program, and Iowa DNR 319 program will be sought in support of such projects. 3) Where dams are failing, ensure the public is presented with a full range of alternatives that include biological connectivity. Zebra mussels blanketed all hard surfaces beneath Lake Delhi, including the dam before the July breach.
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Page 3 and 4: smallest streams to help their youn
Page 5 and 6: Mussel restoration efforts Native m
Page 7 and 8: Iowa endangered fish Lake Sturgeon
Page 9: lower portions of southeastern and

3 Dams and River Ecology - Iowa Department of Natural Resources

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