Iowa DNR
Iowa DNR Fish Kill Database

Fish Kill Event - Unnamed Tributary to Floyd River

West Floyd Park, Le Mars

Event ID
969
Date of Kill
5/31/2018
Waterbody Type
River/Stream
Cause Origin
Anthropogenic
Cause
Ammonia/Fertilizer
Mode
Spill
Magnitude
1 (1 - 100 fish killed)
Kill Length
not enumerated
County
Plymouth
ESD Field Office
FO 3
Fisheries Office
Spirit Lake Hatchery
LongDD
-96.18113
LatDD
42.79108
Created Date
3/28/2019 8:54:02 AM
Last Update
3/28/2019 8:54:02 AM
For more information about this fish kill event, contact the Field Office or Fisheries Office listed above.
Impacted Assessment Segments
No segments listed
Lat/Long uses WGS84 datum
Onsite Comments

We were notified of an ammonia release from a cooling unit from NOR-AM Cold Storage in Le Mars that occurred at about 5:00 P.M. on 5/31/18. The ammonia, mixed with water, went down a roof drain, to the storm sewer and to a small tributary to the Floyd River.

Upon investigation, about 50 dead fish were observed in the tributary/storm sewer outlet near West Floyd Park in Le Mars. In fact, people observing ball games last night reported an ammonia odor to the City, hence the discovery.

An employee of NOR-AM was performing maintenance on an evaporator unit. An open valve allowed ammonia to escape the unit. It is estimated that 21 pounds ammonia, in total, was release. This was enough to cause the small fish kill of minnows and chubs.

ES staff measure a high of 7.5 ppm ammonia near the ball park. There was no detectable impact on the Floyd River, nor is there expected to be. The contaminated water (about 440 gallons) was pumped from the storm sewer/tributary.