Iowa DNR
Iowa DNR Fish Kill Database

Fish Kill Event - Otter Creek

West Union

Event ID
1018
Date of Kill
8/9/2022
Waterbody Type
River/Stream
Cause Origin
Unknown
Cause
Unknown - Anthropogenic Suspected
Mode
N/A
Magnitude
5 (10,001 - 25,000 fish killed)
Estimated Fish Killed
20,172
Kill Length
3.86 miles
Valuation
$3,099.91
Investigation Expenses
$1,393.82
County
Fayette
ESD Field Office
FO 1
Fisheries Office
Decorah State Hatchery
LongDD
-91.79323
LatDD
42.94743
Created Date
9/28/2022 12:18:11 PM
Last Update
9/28/2022 12:18:11 PM
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

Water clarity excellent, no visible odors, numerous dead crawdads and darters littering stream bottom, unscaled fish (Stonecats) seen swimming erratically or dead. Prior to and during investigation, aerial spraying occurring. Aquatic vegetation present in upper sections (Horned and Flat-stemed Pondweeds), areas with gravel/cobble or silt substrates throughout. Overhanging vegetation densely covering undercut banks. Portions of this stream are stocked weekly with Rainbow Trout and throughout maintains a naturally reproducing Brown Trout population.

FISH KILLED

Species

Size of Fish

Number Killed

Minnow, Shiners, Dace, Chub

All

2,949

Stonerollers

0-6

13

Darters

0-2

16,997

Suckers

0-3

8

Stonecat

3-8

64

Green Sunfish

3-6

20

Rainbow Trout

0-17

4

Brown Trout

0-17

117