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 (Anthro 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

Highlighted river segments indicate those impacted in part or whole by this fish kill event. It is not meant to represent the actual extent of the kill.

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