Grand Prismatic Spring is located in Yellowstone National Park. Measuring somewhere at 370 feet in diameter and just over 120 feet deep, it's the largest spring in the United States. The Color of the spring comes from microorganisms. The microorganisms present in the spring produce color ranging from green to red depending on the temperature and other contributing factors. The temperature of the spring range from 150 degrees to a high of around 190 degrees. The deep blue color in the middle of the spring comes from the purity and depth of the water. Much like you would see in a much larger body of water.
Grand Prismatic is a difficult subject to photograph. The boardwalk at the spring will get you up close but it will be hard to capture the full spectrum of color the spring displays. Also there is an abundance of steam and being close to the spring makes this photographic subject difficult.
Your best bet is to climb a hill to get a better view. There is a small parking lot just south and west of the official lookout. Park here and hike north for about a 1/4 mile then climb the biggest hill you can find. You will see multiple trails heading up the various foothills. I started taking this route but there was bear sign and also park warnings of bear in the area, although I did have my bear spray I didn't want a risk it. So I decided to head back and drive north to a pullout and climb the hill on the east side of Grand Prismatic. After reaching the top of the hill I captured an 8 image panorama and this weeks post picture.
Your best view may come from a helicopter, but the surrounding hillsides do provide good photographic opportunities. Be patient and wait for the steam to dissipate. Work quickly, you may only have several seconds to capture the image you are looking for.
The color alone makes this spring a must see and is highly recommended.