The National Park Service’s report on the continuing issues of Yellowstone Park is full of grim news. Daily visitations continue to climb, leading to stress on the infrastructure, and all the invasives spread by car tires, clothing, and felt soles, continue to resist efforts at controlling them.

On Yellowstone Lake:

Nearly 550,000 lake trout have been removed from the lake
since 1994, including about 146,000 in 2010. The number
of lake trout caught per 100 meters of net has been rising
since 2002, suggesting that the lake trout population has
been increasing faster than the fish are being removed.

On the creepy crawly invasives:

First detected in the park in 1994, New Zealand mud snails
are now in all of the major watersheds, where they form dense colonies and compete with native species.

… and on us:

After exceeding 3 million for the first time in 1992, annual visitation at Yellowstone fluctuated between 2.8 and 3.1 million until new records were set in 2009 (3.3 million) and 2010 (3.6 million). About 70% of the visitation occurs from June through August. Although there are no day use quotas, lodging and campgrounds in the park can accommodate only about 14,300 visitors during the summer, while daily visitation during July 2010 averaged 30,900. Fall visitation has increased since the 1980s and now comprises about 21% of annual use; winter visitation has never been more than 6% of the annual total.

With all those vehicles and their sticky rubber tires, over 20000 acres of invasive plants were treated, many with herbicides, a first for Yellowstone. Campgrounds and trails are consistent sources for most of the vegetative invasives, suggesting it’s us at the root cause.

With little change from the 2000 plan, and a harsh economic environment, it suggests “fighting them to a draw” might be a valued outcome, given a Congress with little sympathy and no mandate other than steep cuts in spending.