FARMINGTON, N.M. — Well-tanned and with an easy-going demeanor, Curtis Bailey doesn't strike you as a workaholic.

But as a fishing guide on the San Juan River in northwest New Mexico, there's not much down time.

"I guided 232 days last year," Bailey says. "I've guided on Christmas, New Year's Day."

The San Juan is arguably one of the best fly-fishing rivers in the United States. Because the average high temperature in January is 40 degrees, the fishing never really stops.

And that's just fine for Bailey, a guide for the Soaring Eagle Lodge.

"My dad says, 'You still don't have a real job,"' Bailey quips, "'but you have a great office.'"

Bailey's "office" became a fisherman's dream with the completion of Navajo Dam in 1962.

"Before the dam was built, it was a really highly fluctuating, silty river, like most of the rivers in the Southwest," says Marc Wethington of the New Mexico Department of Game and Fish.

Catfish and pike minnows (which were known as squawfish) were in abundance at that time — but not trout.

But the dam has helped create perfect conditions for trout.

"It's a deep-release reservoir, so you've got cold water year-round and you've got clear water, because you're losing your sediments," says Wethington, the fisheries biologist for the San Juan River. "They're all being deposited into the lake before being released out of the bottom of the dam.

"You're releasing cold, clear water that's fairly nutrient rich. ... It is a nice spot and a very productive fishery."

That's helped the San Juan — which flows into Lake Powell in Utah — earn a rating as one of the top tailwater fishing spots in the country by Field and Stream magazine.

On a beautiful June morning, Bailey and I started our float trip about a mile from the reservoir. We put in at Texas Hole, a popular spot among those in boats or waders.

Water recycles constantly in the eddy, and three channels feed into Texas Hole, which at 15 feet is the deepest water on the river. By 9 a.m., there were four drift boats at the spot, along with a couple of guys up to their thighs in water along the shore.

I've informed Bailey that the extent of my fly-fishing experience is repeat viewings of "A River Runs Through It." He smiles and assures me not to worry as he ties a size 22 midge and size 16 red San Juan worm.

"It imitates an aquatic worm that lives in the water," Bailey says. "You see these tiny midges flittering around, they look like little gnats."

We use a 5-weight fly rod with a 9-foot leader, tying a 5X tippet to a 6X tippet (3 1/2 pound test).