The station was originally built on 1570 kHz with a power of 500 watts and the transmitter located in the 'Sugarhouse' area of Salt Lake City in 1956. It operated during daytime hours only. In 1977, nighttime operation at 500 watts was added. On January 1, 1988, the station's callsign was changed to KZQQ, and the station aired the
Z Rock heavy metal format. By 1990, the station's format had changed to Spanish language music, and was branded "La Fabulosa". The station later adopted a
religious/gospel format during the day, while Spanish language programming remained on the station at night. On July 31, 1992, the station's callsign was changed to KRGQ, and the station began airing a country music format during the day, while Spanish language programming remained on the station at night. In December 1993, the station's country music programming began to be simulcast on
KQOL 106.5, as well. By 1995, the station had been taken off the air. In 1997, the station was rebuilt at its current transmitter location of 6211 West 2100 South in West Valley City. On March 10, 1997, the station's callsign was changed back to KRGO. On January 16, 1998, the station's callsign was changed to KMRI. The station's callsign stood for "
Miracle
Rock
Incorporated Church", which owned the station when it was assigned. In 2003-2004 the station made arrangements with the then–owner of KCPW (AM) (now
KIHU), Community Wireless of Park City, to share its single tower as "Tower 2" of the other stations two tower directional array. In 2005, the owners of the radio station made a contract with David J Velasquez, president of Radio Exitos Communications Inc and began transmitting Regional Mexican Music which also included Spanish Christian Music a program of 4 hours everyday from 2-6 p.m. Musica para tu alma played for 1 year, then two hours a day for two years. The president of Radio Exitos Communications Inc sold the contract to Victor Galindo owner of Victor's Tire. For the remainder of the contract. The contract was renew with Victor Galindo owning the new contract. Then the radio station was sold to the new corporation.
Tower Collapse On March 18, 2020, a 5.7 magnitude
earthquake happened near
Magna, Utah, southwest of the station's tower. The earthquake knocked the station off the air after its tower collapsed. The earthquake's epicenter was north-northeast of the city of Magna, putting it near the
Great Salt Lake or close to the towers. The collapse also affected
KIHU, which was operating at reduced power. KMRI filed for
special temporary authority to go
silent.
Legal Proceedings and Chapter 11 Subchapter V Reorganization On March 26, 2020, AASAA Media LLC DBA KMRI Radio was placed into involuntary receivership by Judge Matthew Bates of the Third Judicial District Court of Salt Lake County. KMRI's license was auctioned on July 17, 2020, by the court appointed receiver Jacob Hibbard, with the plaintiff in the foreclosure auction acquiring KMRI's license by placing a $75,000 credit bid. On July 28, 2020, AASAA Media LLC DBA KMRI Radio voluntarily filed for Chapter 11 reorganization under Subchapter V and became Debtor-in-Possession [Trustee] of the FCC License and other assets; and is continuing operations of KMRI Radio via digital streaming until its antenna tower can be restored. One of the members of AASAA Media LLC, Nicolas Alejandro Vicente, died on August 21, 2020. The bankruptcy case previously filed by AASAA Media, LLC, was dismissed on October 26, 2020. On March 16, 2021, KMRI briefly resumed broadcasting with reduced power and an emergency wire antenna in order to prevent the station's license from lapsing before the expiration of the one year silent period. According to the Special Temporary Authority (STA) application filed with the FCC by receiver Jacob Hibbard, KMRI's Nautel transmitter sustained minor damage during the March 18, 2020 Salt Lake City earthquake which caused the station's tower to collapse. Replacement parts for the transmitter were obtained and installed prior to the temporary resumption of operations on March 16, 2021. On January 19, 2023, the FCC dismissed receiver Jacob Hibbard's Petition for Reconsideration, denying the standard renewal period of 8 years for the station's license. The FCC license for KMRI is currently set to expire on April 21, 2023, and the station remains off the air as of February 8, 2023. On March 3, 2023, KMRI briefly resumed broadcasting with a temporary antenna to preserve the station's license before the expiration of the one year
special temporary authority silent period on March 9, 2023. The current engineering STA expires on August 28, 2023.
Return to the Air with Sports On October 2, 2024, KMRI returned to the air with a sports talk format, branded as "SLC Sports Radio", with programming from
Sports Byline USA. That programming ended abruptly in early 2026. On January 5, 2026, Wood filed a request to change call letters to KOSL, which was approved by the FCC on January 9, 2026. On March 6, 2026, KOSL began running a "10,000 songs in a row" stunt loop, identifying on-air as "Oldies 1550". ==References==