The Denver Rock ‘N’ Roll full marathon has run its course: Race organizers said Friday that the 26.2-mile event will not continue in 2016.

“After several meetings with the City of Denver. we are collectively focusing our resources on operating the premier half-marathon in the state of Colorado,” Alan Culpepper, vice president of the Rock ‘N’ Roll Marathon Series, said in an interview with The Denver Post.

Culpepper said within the last couple of weeks, the city and race organizers agreed that finding 26 miles within the metro area that did not negatively impact either runners or residents was nearly impossible.

“It was the changing of Denver in general and the density of residents that has increased dramatically, along with the proliferation of events in the city, in general, that just led to an impasse,” Culpepper said. “It’s not something that the city could sustain and that we could feel good about.”

Culpepper is no stranger to the metro Denver running scene — he was on the University of Colorado running team in the early 90s. He is seven-time national champion in track and cross country, and he’s qualified four times for the World Championship Team. In 2004, he won the Olympic marathon trials and finished 12th the following year in the marathon at the Athens Olympic Games. He operated Solepepper Sports in Louisville until he left in 2010 for San Diegoand Competitor Group, which owns th marathon series.

Changes to the Denver 2015 marathon, scheduled for Oct. 18, spurred outrage from many participants who claimed that the race had lost touch with the city and was denying them the experience they paid for.

“The Rock ‘N’ Roll marathon is expensive,” said Rich Adams, who has done one full Rock ‘N’ Rolland three half marathons over the last several years. “Sure, they have good medals and shirts, but now they’re having so many problems and changes that I didn’t expect.”

Among the changes: the 26.2-mile route this year is leaving City Park and instead beginning at the Adams County Fairgrounds, taking runners through Brighton, Thornton and eventually downtown Denver.

“Nothing against Brighton, but there’s not much out there,” Adams said. “I’m not expecting many fans to come cheer us on.”

Read more: Denver Rock ‘N’ Roll Marathon runs its course: 2015 will be last | The Denver Post