Officials say 230 000 gal. spilled after the derailment, with some of it being carried down the Little Rock and Rock rivers.
One or more of 31 tanker cars on the derailed train is leaking into floodwaters surrounding the tracks near Doon, about 40 miles (65 kilometers) southeast of Sioux Falls, South Dakota.
The public's interest in the train derailment is making it extremely hard for clean up and construction crews to get in and out of the area. The nearby Little Rock River rose rapidly after heavy rain Wednesday and Thursday.
Reynolds was set to visit the derailment site Saturday afternoon as part of a tour of areas hit by recent flooding.
In this aerial drone image taken from video and provided by the Sioux County Sheriff's Office, tanker cars carrying crude oil are shown derailed about a mile south of Doon, Iowa, Friday, June 22, 2018.
Within hours of the derailment, BNSF had brought in dozens of semitrailer trucks loaded with equipment to clean up the spill.
BNSF spokesman Andy Williams confirmed the details Saturday.
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"We are working as quickly as we can to get this cleaned up", Williams said Saturday.
A major part of that work includes building a temporary road parallel to the tracks to allow in cranes that can remove the derailed and partially submerged oil cars.
Olson says the city, with a population of almost 3,400, will use the rural water supply until testing by the Iowa Department of Natural Resources confirms the safety of the city's drinking water.
The spill threatened to contaminate drinking water for residents about 150 miles (240 km) downstream in Omaha, Nebraska.
The train was carrying tar sands oil from Alberta to Stroud, Okla., for ConocoPhillips. ConocoPhillips spokesman Daren Beaudo said each tanker can hold more than 25 000 gal. of oil.
The service has issued flood warnings for several other rivers and creeks in the area, including the Big and Little Sioux rivers, the Floyd River and the Ocheyedan River near Spencer. In the meantime, the city is getting its water from the nearby Rock Valley Rural Water system, which Olson said is not in danger of being contaminated by the spill.
Olson says the city will use the rural water supply until testing by the Iowa Department of Natural Resources confirms the safety of the city's drinking water.