Iowa DNR
Iowa DNR Fish Kill Database

Fish Kill Event - Little Bear Creek

1 mile west of Malcom

Event ID
982
Date of Kill
9/11/2019
Waterbody Type
River/Stream
Cause Origin
Anthropogenic
Cause
Animal Waste
Mode
Runoff
Animal Waste Source
Confinement
Animal Type
Poultry
Approx Head
7500000
Magnitude
1 (1 - 100 fish killed)
Kill Length
1.50 miles
County
Poweshiek
ESD Field Office
FO 5
Fisheries Office
Lake Macbride Station
LongDD
-92.58350
LatDD
41.71313
Created Date
9/19/2019 8:30:21 AM
Last Update
9/19/2019 8:30:21 AM
For more information about this fish kill event, contact the Field Office or Fisheries Office listed above.
Impacted Assessment Segments
Lat/Long uses WGS84 datum
Onsite Comments

Poweshiek NRCS/SWCD Watershed Coordinator sent an email to FO about observing a large number of dead fish in Little Bear Creek Starting about one mile west of Malcom where 110th Street crosses the creek to the south side of Malcom where Highway 63 crosses the creek. She reported seeing fish of several species from a few inches long to 9-10 inches long.

FO staff report:

I started checking the Little Bear Creek Watershed about 1 mile east of Grinnell where 50th Street crosses Little Bear Creek working east toward Malcom where the fish kill was reported. At the 100th Street crossing I measured Ammonia as N at 0.0 mg/L, water Temperature 78*F, pH 6, and Dissolved Oxygen (D.O.) 6.0 mg/L. I did not see any dead fish at the 100th Street crossing. When I conducted tests at the 110 th Street crossing I measured Ammonia as N at 1.68 mg/L, water temperature 80*F, pH 5, and D.O. 5 mg/L. I counted 7 dead fish mostly small with one fish about 9” long. I proceeded east to Malcom where 410th Avenue turns from going east to west to north to south at the southwest part of town. At the crossing over the creek I measured Ammonia as N at 1.68 mg/L, water Temperature 80*F, pH 5, and D.O. 5.0 mg/L. I counted 14 dead fish ranging from small to medium size (9” to 10” long). I went east to the bridge where Hwy. 63 crosses over Little Bear Creek at the south end of Malcom. I measured Ammonia as N at 1.68 mg/L, water Temperature at 80*F, pH 5, and D.O. 4 mg/L. I counted approximately 40 dead fish ranging from small to medium size. I went east of Malcom where 130 th Street crosses the creek and measured Ammonia as N at 0.72 mg/L, water Temperature at 80*F, pH 5, and D.O. 5.0 mg/L I did not see any dead fish as this location. I went approximately 3 miles further east (just east of Brooklyn) where 400th Avenue crosses Little Bear Creek and measured Ammonia as N at 0.0 mg/L, water Temperature at 80*F, pH 5, and D.O. 6.0 mg/L. I did not see any dead fish. It appeared the fish kill started somewhere between 100th Street and 110 Street and continued east through the town of Malcom and corresponded to where I measured Ammonia as N in concentrations greater than 1.0 mg/L.