[Related News] Balancing the scales for fish in the river
source: Copyright © 2006 The Pueblo Chieftain
[Related News] Balancing the scales for fish in the river
Wildlife workers try to remediate the damage to aquatic life in Arkansas River.
By CHRIS WOODKA
THE PUEBLO CHIEFTAIN
SALIDA - Good news: Christo’s proposed draperies wouldn’t hurt fish in the Arkansas River.
Bad news: People could, if they’re not careful.
Colorado Division of Wildlife biologist Greg Policky took a look at the Arkansas River from the fishes’ point of view last week at the Arkansas River Basin Water Forum.
Overall, better management of the river since World War II is starting to make up for the damage done in the century before, but more has to be done, Policky said.
One question veered off-course from the scientific to the political realm: Will Christo impact the fish?
“No, he’ll impact the fishermen more than the fish,” Policky said, referring to a proposed artwork that would drape stretches of the river with colorful fabric. The project still does not have state and local approval.
If tourists view the project from a passing car window, there would be little impact on the fish. But if they get out of the cars at a few turnouts to get a closer look, they could contribute to the ongoing erosion problem, Policky said.
More damaging are the everyday impacts people have on the river - impacts that have continued for 150 years, he said.
Today, the river above Canon City is constricted by U.S. 50 on one side and the railroad on the other, cutting off its natural meanders that used to slow its velocity.
“It cuts a deeper, faster channel through the canyon,” Policky said.
Poor land management has reduced undergrowth in the watershed, causing more erosion and sedimentation. The problem is worst during floods.
“Blowouts drop tons of sediment into the river,” he said.
Mine tailings continue to leach into the river, although they have been better controlled in the past five years, he said.
“A lot of us remember when the Arkansas River turned orange all the way to Salida in October 1985 from a blowout in the Yak Tunnel,” Policky said.
A voluntary flow program regulates the amount of water in the river, allowing fish to spawn in the fall and protecting them from rushing whirlpools of water to some extent at other times, he said.
But that same flow program can lower the elevation of Twin Lakes by feet in late summer, taking the warmest water off the top of the lakes when they are in their most productive period, at least from a fish’s point of view.
Policky traced the history of fish in the basin since man’s arrival in the mid-1800s.
Two native species were virtually wiped out because of overfishing and introduction of non-native species.
While the yellowfin cutthroat trout became extinct by the late 1800s, a population of greenback cutthroat trout is being restored above Twin Lakes. The greenback cannot compete with the brown trout on the Arkansas River mainstem, however.
Policky said the greenback recovery program has been a success.
“The goal of the recovery plan is to develop catch-and-release fisheries,” he said.
In bygone days, the federal fish hatchery at Leadville, along with numerous other hatcheries in the valley, stocked the river with non-native species. While increasing the supply of fish, past practices did little to improve habitat. Commercial fishermen harvested the river to feed the miners. Grazing went unchecked, disturbing the ground cover. Mines belched heavy metals into the streams.
After World War II, wildlife management, conservation and habitat improvement efforts began on several fronts. Limits were placed on anglers, water quality regulations were implemented and grazing restrictions were put in place. Boulders were placed in the river by the Bureau of Land Management to improve fish habitat.
While fisheries still must be stocked, a sustainable fish population is developing. The fish in the river today are more plentiful, larger and healthier than 10 years ago, he said.
“We could not make good fisheries by throwing rocks in it or sticking a regulation on it,” Policky said. “The fish population is the ultimate indicator of how well we’re doing.”
But what’s good for the fish may not always be good for people.
During the drought of 2002, when river flows were sluggish, the fish thrived.
“Normally, there’s too much water in the Arkansas River, too much velocity,” Policky said. “If you’re a fisherman, you’re still seeing the difference today.”
artwork © Wolfgang Volz / Christo
photo © 1996 Wolfgang Volz
photo © 2005 Wolfgang Volz / laif
At the Business School, after environmental artists Christo (left) and Jeanne-Claude talk about how they fund and plan their enormous projects, they show pictures and maps of their current work-in-progress, 'Over the River,' an installation that will span parts of the Arkansas River in Colorado. (Staff photos Maggie Mastricola/Harvard News Office)
Christo: 'What is great in art is the freedom of the creative process. When a project happens, it is never because someone else decided that they want it there. There is no other reason for it to exist. That is why they attract so many people.'