Heat hits Big Sioux; kills fish - KTIV News 4 Sioux City IA: News, Weather and Sports

Heat hits Big Sioux; kills fish

Posted:
By Kristen Johnson, Multimedia Journalist/ Weekend Anchor - bio | email
SIOUX FALLS, S.D. (AP) -

The Department of Environment and Natural Resources says low flows, high water temperatures and elevated ammonia levels contributed to hundreds of fish that died and washed up along the Big Sioux River in South Dakota.

The department says its investigation showed the ammonia levels in the river would not have normally been toxic to the fish.

Combined with the stress from the low flows and high temperatures, the ammonia level was enough to kill the fish last week.

The temperature of the Big Sioux River reached 90 degrees last Friday, lowered to 72 on Saturday and was back up to 90 by Tuesday.

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