Just months after the federal government closed on a land exchange with a billionaire, a proposal to institute a permit system on the Blue River has ignited a conversation about river access and fishery health in Colorado. … Blue Valley Ranch, a more than 2,000-acre property owned by billionaire Paul Tudor Jones II, and the nonprofit Friends of the Lower Blue River say a permit system is necessary to manage the negative impacts of increasing fishing pressure. … As part of the exchange, the ranch has agreed to cover the costs of river restoration work for a three-quarter-mile stretch of the Blue River near its confluence with the Colorado River. … Anglers who opposed the land swap because they felt it was tilted toward private interests, said they see the proposed permit system as the continuation of an effort by a landowner to restrict public access to the river.