Since 1969 the fishery management philosophy at Rocky Mountain National Park has been to restore the greenback cutthroat trout, the original native fish. Rainbows, browns and brooks are harvested; the cutthroat is catch-and-release only.
Dream Lake had a fair number of actively feeding trout just downstream of the inlet. Sprague Lake had a fair number of actively feeding fisherman at the large picnic area. The Big Thompson River near the museum looked productive with about a half-dozen fly fisherman.
Bear Lake had a number of rises, but is closed to fishing.
The park is beautiful and has many accessible destinations. Consequently, parking lots fill up before noon and a shuttle has transports for hundreds of people. Some of the trails are paved with asphalt.