Day 46 (7/11): Miles traveled: ~ 250

Location: Yellowstone, ending at Best Western in Billings, MT

Science: air quality measurements (both particulate counter and MicroTops measurements) in Billings, MT

When we woke up in Colter Bay Campground, the sun looked like this:

The mountains looked like this -- 

And then, right before Yellowstone National Park, we saw evidence of past wildfires -- 

We first stopped at Old Faithful. It was crowded and very hot. Rosie was fading already. 

We were lucky to only have to wait 35 minutes for the geyser to blow -- 

Next stop was the Grand Prismatic Springs.....it was even hotter now, and we were hiking by hot springs delivering more heat into the air.........

The hike was a bit too much for Rosie, who stated often and loudly that she "felt worse than she had the last time she had the flu," but the views were incredible. 

Here was Rosie's first response to our view at the end of the hike -- 

But when I told her how the colors in the hot springs occur, and the cool bacteria involved, she perked right up -- 

Just kidding. I told her we would get ice cream at the next stop. 

Anyway -- such an impressive display of the power of thermophiles! I love being a microbiologist.

After that hike (I wasn't sure we'd make it back -- the heat wafting off the tiny (and very cute) little hot springs pools on the way back almost did us both in. I also forgot to bring enough water. Anyway -- we next saw an incredible river canyon, and a very dry Mammoth Hot Springs. 

As we exited Yellowstone National Park, we were hit by a fast-moving thunderstorm, which was the first time I had encountered rain since Grand Isle, LA. 

Our final stop for the day was the Best Western in Billings, MT -- every campground we tried to get into before that was overflowing......and the hotel room we got was one of the last available.

Day 45 (7/10): Miles traveled: ~ 296

Location: half the day in Twin Falls, ID area, ending up at Colter Bay Campground (Tetons), WY

Science: air quality measurements (both particulate counter and MicroTops measurements) in Twin Falls area (Shoshone Falls, Diercke Lake), then at camping spot in Colter Bay Campground (Grand Teton National Park)

When we got back on the road this day, I discovered that I had been dragging the trailer hitch electrical harness and that most of the wires were now exposed and/or completely severed. OOOOOOOOPS. Luckily I had a spare in the (overly robust) repair kit that took up most of my car. I replaced it while Rosie rode around on her scooter in the parking lot. 

We then headed out to Shoshone Falls, about 10 minutes from the motel and clearly an understated natural wonder -- my pictures don't do it justice, but they were similar to Niagara Falls in size and beauty -- including the amazing rainbow emanating from the spray.

Next stop was Diercke Lake, which was a great local swimming hole located upstream of the falls. We set up the air quality monitor in the parking lot and hiked along the lake to find the perfect swimming spot. It was easy....

When we left the lake to get back on the road, I ran into some RV'ers from Utah who had just come from Crater Lake. Luckily Rosie was out of ear-shot when they told me how they had gotten to swim and fish in Crater Lake because the trail had been re-opened (apparently just 3 days after we had been there!). 

They also told me about witnessing (and trying in vain to stop) the start of one of the major Oregon fires pumping smoke into the air along our route -- someone with a small trailer like mine had popped a tire on the highway and the sparks from the metal rims hitting the asphalt became a full-fledged wildfire within 30 seconds. 

"While the driver was still kicking his trailer flat in frustration, several of us pulled off when we saw the flames behind him climbing the bluff. We all ran out with bottles of water and tried to douse it, but it was way too fast," the tall, skinny, baseball-capped REI model/RV'er elaborated.

And here is where my obsession with the health of my tires began -- up until that very second I had not really paid much attention to my trailer tires -- what if I were the next idiot with a tiny trailer kicking a busted wheel while I lit the West on fire? I peered at my tires and thought they looked ok.....maybe a bit bald on the edges? But seemed fine for now.

The drive from Twin Falls to Moran, WY was very mountainous -- I did not have as many white-knuckle moments as in the past, but the views and grades were spectacular and terrifying all the same. We stopped at one particularly impressive spot, which also displayed the steadily thickening wildfire haze -- 

As we entered Grand Teton National Park, the views of the mountains were incredible, even though they were cloaked (and some almost completely hidden) by smoke -- 

Colter Bay Campground was busy but sweet. Some campfires and lots of talk about the wildfire haze. Rosie and I played Ladder Ball. Rosie won, as usual.

The sun was red and weirdly amorphous (at least not clearly round, but a bit smeared at the edges) as it set through the trees.