MONTGOMERY COUNTY, Iowa — A fertilizer spill in early March killed over 749,000 fish in a nearly 50-mile stretch of the East Nishnabotna River.
On March 11 NEW Cooperative, Inc. in Red Oak notified the Iowa Department of Natural Resources of about 1,500 tons of liquid nitrogen fertilizer that was discharged into a drainage ditch and then into the East Nishnabotna River. According to the DNR, an aboveground storage tank valve was left open and caused the spill.
DNR Fisheries staff investigated the impact of the spill and found the fish kill occurred in 49.8 miles of the East Nishnabotna and Nishnabotna Rivers downstream of the spill and ended near the confluence with the Missouri River.
So far, the DNR has found an estimated 749,242 fish killed as a result of the spill. A breakdown of the estimated number of species impacted is below:
- Minnow Shiner Dace Chub: 707,871
- Suckers: 1,542
- Goldeye: 201
- Common Carp: 9,255
- Carpsucker: 14,500
- Buffalo: 4
- Sauger: 199
- Channel Catfish: 7,681
- Flathead Catfish: 264
- Green Sunfish: 935
- Silver Carp: 67
- Largemouth Bass: 69
- Grass Carp, diploid: 6,654
Ammonia levels are declining in the river, and cleanup efforts are ongoing at the NEW Cooperative facility. DNR field staff are working with the DNR’s Legal Services Bureau to determine next steps for enforcement actions and restitution.
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