Janitorial services needed at White River National Forest (WRNF) Supervisor’s Office located at 900 Grand Avenue, Glenwood Springs, CO 81601. The City of Glenwood Springs is located on I-70 at exit 21... Janitorial services needed at White River National Forest (WRNF) Supervisor’s Office located at 900 Grand Avenue, Glenwood Springs, CO 81601. The City of Glenwood Springs is located on I-70 at exit 216. The office contains approximately 7600 square feet of floor area. Approximately 5800 square feet are carpeted and approximately 1700 square feet are tile or linoleum.