ONE-HORSE TOWN: Julie Johnson, manager of cultural resources with Boulder Open Space and Mountains Parks, gives a pat as Jerry Katopodes, a city ranger-naturalist, rides Jack, the City’s only horse. The setting was the Eldorado Springs trailhead. The day, March 30, was (finally) a warm one. Jack, who works horse patrol for Open Space rangers, has been on the job for six years. (Reporter photo)