September 29, 1995 – The U.S. Fish and Wildlife Service proposed to list the least chub as an endangered species and to include critical habitat designation.
March 15, 1999 – The Center filed a lawsuit against the Service for the agency's foot-dragging in regard to endangered species protection for the least chub. Bowing to political pressure, the Service eventually announced a ruling that denied protection for the fish.
June 19, 2007 – The Center, Confederated Tribes of the Goshute Reservation, Great Basin chapter of Trout Unlimited, and Utah chapter of the Sierra Club filed a petition to protect the least chub as a threatened species under the Endangered Species Act.
October 1, 2008 – The Center, Confederated Tribes of the Goshute Reservation, and Great Basin chapter of Trout Unlimited filed a formal notice of intent to sue the administration for failing to respond to our petition to protect the chub.
February 17, 2010 – The Center filed lawsuits seeking protection for 93 species, including the least chub.
June 21, 2010 – In response to the Center's petition and litigation, the Fish and Wildlife Service declared that the least chub warrants protection — but said such protection was precluded by higher-priority species, putting the fish on the “candidate list” to await Endangered Species Act status indefinitely.