Iowa DNR
Iowa DNR Fish Kill Database

Fish Kill Event - Floyd River

N of Sanborn, between Polk Ave and Oak Hill Ave

Event ID
Date of Kill
Waterbody Type
Cause Origin
2 (101 - 1000 fish killed)
Estimated Fish Killed
Kill Length
6.30 miles
ESD Field Office
FO 3
Fisheries Office
Spirit Lake Hatchery
Created Date
3/17/2020 9:11:47 AM
Last Update
3/17/2020 9:37:47 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

On August 18, 2018 a fish kill was reported by Conservation Officer John Sells on theFloyd River northeast of Sheldon, Iowa. The following day ESD personnel were on site and documented dead fish beginning at the confluence of the North Fork of the Floyd River and the Floyd River extending 6.3 miles downstream. Jed Siegwarth, Fisheries Aide, was available to investigate the kill. He observed a similar extent with the kill beginning above Polk Ave and ending on Oak Hill Ave.

As of 8/20/2018, ESD had not identified a source.

Siegwarth arrived on scene at approximately 1:00 p.m. on 8/20/2018. He observed thearea under and around the bridges that crossed over the Floyd River in the area of the kill. Theriver was within its banks with signs the river had been about 1 foot higher in recent days.There were no signs of live fish in the stream. Three species of dead fish wereobserved: green sunfish, white sucker and stonecat/madtom. Fish sizes ranged from 2 to 10inches. Many of the fish found were in an advanced stage of decay making identificationdifficult. indicating the kill occurred a 2-4 days prior. There was heavy scavenger activityapparent in all locations.

Siegwarth counted dead fish on one bank at two 50 yard sections of stream. The firstsection contained 53 dead fish (upstream of Polk Ave bridge), and the second had 62 (upstreamof Oak Hill Ave bridge).

No expansions or further investigation were completed because of the late notification,advanced decay of the fish, and finding of no responsible party.