We hit the historic railroad trail at Lake Mead National Recreation Area in Boulder City for an upcoming story in Rails to Trails magazine.

It was about 95 degrees or so when we were out on the trail, hot, but not unbearable.

These tunnels on the trail certainly help.

Check out the rest of the pix, including some of bighorn sheep we saw, after the jump.

We saw these sheep between the first and second tunnels.

The trail itself is an old rail line, built in 1931, to haul men and materials to the construction site for Hoover Dam, then called Boulder Dam.

There's a spur from Railroad Pass about 10 miles west of Hoover Dam, through Boulder City and to the river.

But we just covered the final couple miles from Lake Mead Recreation area.

Here's a view of the Las Vegas Boat Harbor marina.

Check out the low lake level. That's where Las Vegas gets its water. Yikes.

The trail head at Lake Mead rec area was about 30 miles from downtown Las Vegas.

We would have hung out longer, but Elko the dog thought it was too hot. And we didn't bring enough water for him to drink and pour on him to keep cool. Next time, I'm bringing a spray bottle to mist him.