The Cheyenne River Sioux Tribe has declared an emergency as dozens of people have been evacuated from rising waters. 

The Moreau River valley is experiencing record-breaking flooding.

Remi Bald Eagle sent KELOLAND News these photos of flooding near White Horse, S.D. 

They have requested voluntary evacuations. Officials say some people have been evacuated by helicopter as their homes are isolated by water. However, fog on Wednesday is preventing helicopter rescues. 

Officials are also concerned that people are refusing to evacuate due to concerns about livestock and property. 

Residents in the flood area should take our warnings seriously. The river has never been this high and it is only rising so take the opportunity to evacuate now. You are placing not just your life but the lives of those who will try to rescue you at risk, chairman Harold Frazier said. 

About 50 homes are in danger, tribal leaders say. The government is also requesting swift water rescue teams to help in the evacuations. 

The river isn’t expected to crest until Thursday. 

Gov. Kristi Noem visited Eagle Butte on Monday.

KELOLAND News has reached out to the state to see how South Dakota is supporting the tribe. We’ll update this story when we have more details. 

This is a developing story.