Grotto Geyser - Yellowstone N.P., Wyoming - Hot Springs on Waymarking.com

Grotto Geyser is a fountain-type geyser with an unusual 8 foot high cone covering the eruptive pond. The cone is the result of a tangled mass of logs which fell over the eruptive pond and became coated with siliceous sinter. The interval between eruptions ranges from less than an hour to about 2 days. The eruption duration ranges from 1 to 26+ hours. The longer the duration the longer the time until the next eruption.
Information sources: The Geyser Observation and Study Association (visit link) and Yellowstone National Park.com (visit link)
Text of sign at Grotto Geyser:
Grotto Geyser
Grotto is perhaps the most unusual of Yellowstone’s geysers. Geologists believe that hundreds (or thousands) of years ago, Grotto Geyser emerged in a stand of dead or dying trees and, through time, deposited layer upon layer of siliceous sinter (silica) over the stumps and branches.
Fast Facts:
Grotto’s initial eruption can reach heights of more than 40 feet, but then generally subsides to about 15 feet.
The duration of Grotto’s eruption can vary from about 50 minutes to more than 24 hours.

Temperature (F): 201 Temperature (C): 94 Type: Developed Cost?: Use Fee Open to the Public?: no Clothing Optional?: no Other Amenities: Adjacent to boardwalk trail in Upper Geyser Basin.

Visit Instructions:
1. Include a photo of the hot spring

2. Describe your visit.

Recent Visits/Logs:

Date Logged Log User Rating   07/29/2022 chrissyml visited it 09/19/2019 dzeih visited it 08/25/2018 moelsla visited it 01/22/2016 BFin visited it 06/17/2013 DukeRoom visited it 07/27/2012 The_Simpsons visited it 10/02/2010 Volcanoguy visited it

View all visits/logs