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A fertilizer spill this month in southwest Iowa killed nearly all the fish in a 60-mile stretch of river with an estimated death toll of more than 750,000, according to Iowa and Missouri conservation officers.
That is the biggest fish kill in Iowa in at least a decade and the fifth-largest on record, according to state data.
And it could have been worse: Fish populations were likely smaller than normal when the spill happened because of cold water temperatures and low river flows.
“Thank goodness, in a way, it happened when it did,” said Joe Larscheid, chief of the Iowa Department of Natural Resources’ fisheries bureau. “But this is a big one. It’s a lot of river miles that have been impacted.”
The spill originated at NEW Cooperative in Red Oak, where a valve that either malfunctioned or was not properly closed leaked about 265,000 gallons of liquid nitrogen fertilizer, most of which went into the nearby East Nishnabotna River.
The leak happened on a weekend from March 9 to 11 in an area where the fertilizer is distributed to customers of the farmers’ co-op. That area is not required by state rules to have barriers that would prevent a leak from reaching the river.
The result was a widespread annihilation of aquatic life.
A DNR investigation found dead or dying fish for 50 miles of river — beyond where the East and West Nishnabotnas meet — all the way to the Missouri border. There were also numerous dead frogs, snakes, mussels and earthworms.
The DNR will return in late spring to note whether the fertilizer killed turtles that had buried themselves in the river bottom for winter. Their bloated carcasses will float to the river surface.
Todd Meyer, of Shenandoah, planned to fish the East Nishnabotna not long after hearing about the spill. River contaminations have happened in the area but have never impeded his boating trips on the east or west segments of the river.
For example: About a week after the fertilizer spill, gasoline overflowed from an underground tank at an Atlantic convenience store, and some of it went into the East Nishnabotna. That did not result in an apparent fish kill, the DNR said.
But after the fertilizer spill, “the whole river was full of dead fish,” Meyer recalled. “It was just nuts.”
Meyer used a drone to survey the dead fish in the East Nishnabotna River a few days after the spill.
The carnage continued into Missouri, where the unified Nishnabotna River flows for about 10 miles before it meets the Missouri River.
Matt Combes, a science unit supervisor for the Missouri Department of Conservation, said there was “a near total fish kill” in that state.
“I can’t even think of another instance where a fish kill occurred out of state and moved into our state,” he said.
The department surveyed one bank of the river for about two miles and counted nearly 4,000 dead fish. It will use that sample to estimate the total number of fish that were killed, Combes said, which will likely be in the tens of thousands.
The department is continuing to monitor the Missouri and Nishnabotna rivers for additional effects from the contamination. It’s possible NEW Cooperative will face sanctions in both states.
The size of the fish kill in Iowa was estimated to be about 749,000, said Chris Larson, a fisheries supervisor for the DNR. Small fish such as minnows and chubs account for the vast majority of those fish, but among them were also about 7,700 channel catfish that anglers target.
Those who are responsible for fish kills typically pay restitution to the state based on the number and types of fish that die. Larson said a total restitution amount has not yet been solidified, but that the estimated value of the small fish is about $85,000. The value of the catfish would be about $115,000.
Those two figures combined would be the largest valuation for a documented Iowa fish kill, according to DNR data.
Others that have caused recent fish kills have typically paid fish restitutions and a fines of up to $10,000 — the maximum the DNR can order administratively. The department has the option to seek higher penalties in district court.
Iowa Capital Dispatch is part of States Newsroom, a nonprofit news network supported by grants and a coalition of donors as a 501c(3) public charity. Iowa Capital Dispatch maintains editorial independence. Contact Editor Kathie Obradovich for questions: info@iowacapitaldispatch.com. Follow Iowa Capital Dispatch on Facebook and Twitter.
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