Feeding the Public’s Fish

How Colorado’s Laws Allow Private Manipulation of Public Rivers — and Why That Should Concern Us All

By Zach Weinzetl

Colorado’s rivers are not just features on a map. They are arteries—moving snowmelt, memory, and meaning from high country headwaters to desert canyons. They are where many of us first learned patience, humility, and the strange intimacy that comes from standing in cold water watching something wild move past us.

They are also, by law, public.

And yet on the Lower Blue River, something deeply unsettled is happening—not behind closed doors, not hidden from view, but spoken aloud in public meetings, documented in agency reports, and quoted in regional newspapers. When those records are placed side by side, they reveal not a single act of wrongdoing, but something more troubling: a regulatory void that allows private interests to materially manipulate public fish in public water, without clear limits, oversight, or accountability.

This is not a story about villains.
It is a story about laws that never imagined what is now occurring.

In a widely circulated Aspen Times article examining the declining health of the Lower Blue River fishery, Blue Valley Ranch Natural Resource Manager / Fish Biologist, Brein Rose described what he called “temporary feeding based on fish health, water quality, streamflow, and natural food availability.”

It is an innocuous phrase at first glance, almost clinical. But the variables listed—water quality, streamflow, natural food availability—do not exist in abstraction. They exist in the river itself. There is no mechanism by which those conditions can be altered without introducing material directly into the river channel or into waters that are hydraulically connected to it.

Temporary or not, feeding is occurring in public water.

That conclusion becomes impossible to ignore when read alongside CPW’s own Lower Blue River Fisheries Report, which includes photographs of trout captured downstream with stomachs visibly packed full of pellet feed. Rivers, by definition, move. Anything placed into them—nutrients, sediment, pollutants, or pellets—travels downstream, indifferent to deeds and property lines. To suggest feeding did not occur “in this stretch” collapses under the most basic physics of flowing water.

That contradiction sharpens further when placed next to statements made on the record at the Grand County Board of County Commissioners meeting during the Friends of the Lower Blue presentation.

At roughly fifteen minutes into that meeting, a moderator asks a simple, direct question: whether fish are fed in the main channel of the Blue River.

Robert “Rob” Firth—introduced as a consultant for Blue Valley Ranch, formerly with Trout Unlimited and before that the Colorado Division of Wildlife—responds plainly:

“No.”

But moments before and after that answer, Mr. Firth provides clarifications that quietly unravel it.

He explains that the side channels connected to the river are “essentially state water,” and that any fish entering them become the property of the State of Colorado. He confirms that once fish are released into those side channels, they are free to move into the main stem of the Blue, upstream or downstream. He further notes that state law requires private ponds to retain fish, which is why fish raised in licensed ponds are physically released into the side channels rather than directly into the river.

Taken together, these statements establish something remarkably clear.

Fish raised as private property are released into state waters. Once released, they become public wildlife. Those fish then move freely into the main channel of the Blue River. And if feed is introduced upstream in sufficient volume—as CPW’s own photographs demonstrate—it does not remain politely confined to a single reach.

To say feeding did not occur “in the river” begins to sound less like a factual distinction and more like a semantic one.

So why hasn’t Colorado Parks and Wildlife called this illegal?

The answer lies not in what the law permits, but in what it never anticipated.

Under current CPW regulations, “chumming” is prohibited only when three specific elements are present: material is placed in state waters, the purpose is to attract fish, and that attraction is intended to facilitate harvest. Remove the intent to catch or take fish, and the rule loses its teeth.

If a landowner asserts that fish are being fed to grow them—not to attract them for angling—then CPW lacks a clear, explicit regulation that says feeding fish in a public river is illegal in and of itself. This is not because the practice is authorized or endorsed. It is because the regulation was written to govern anglers, not private landowners operating what amounts to an open-system feeding regime connected to public waters.

The law does not affirmatively state that feeding fish in public rivers is lawful. It simply fails to prohibit it clearly when harvest is not the stated goal.

That distinction matters.

What exists here is not legal permission, but regulatory silence.

And silence, when it comes to wildlife management, carries consequences.

Once fish are released into state waters, they are held in trust for all Coloradans—not selectively managed for the benefit of adjacent landowners. Feeding them in a way that alters their behavior, concentrates biomass, changes nutrient dynamics, and facilitates disease transmission does not remain a private act simply because it begins on private land.

This is not a closed pond. It is not a contained system. It is a living river whose fish move, whose nutrients cycle, and whose diseases—like Gill Lice—do not recognize ownership boundaries.

Colorado water law has long been clear on one principle: owning land along a river does not grant unilateral control over what happens in the water itself.

Intent to harvest is not the only legal or ethical standard that applies. Wildlife health, public trust doctrine, water quality protections, and disease management all exist independently of whether someone plans to catch a fish.

The fact that CPW regulations have not yet caught up with this behavior does not insulate it from scrutiny. It exposes the urgency of that scrutiny.

This is not a “gotcha.”
It is not an accusation masquerading as advocacy.

It is a warning light.

Colorado’s wildlife laws were written for a different era—one in which anglers might scatter corn or pellets to draw fish closer to a hook, not one in which private entities could materially manipulate public fisheries by feeding state-owned fish in state waters at scale.

The state has not yet answered that reality with clear rules.

Until it does, we are left with a river that is public in name, private in practice, and governed by a patchwork of silence where stewardship should be.

Rivers do not stop flowing because laws lag behind.
And truth, like water, eventually finds its way downstream.