Island Park
Posted by: Groundspeak Premium Member Volcanoguy
N 44° 27.244 W 111° 21.812
12T E 471077 N 4922371
Quick Description: History sign near Island Park at north end of Fort Henry Historic Byway.
Location: Idaho, United States
Date Posted: 8/13/2011 8:13:01 PM
Waymark Code: WMC9T1
Published By: Groundspeak Premium Member muddawber
Views: 2

Long Description:
This history sign is located at a Fort Henry Historic Byway information site a tenth of a mile west of U.S. Hwy. 20 on County Road A2 and discusses the history of the Island Park area. There are additional informational signs nearby.
Marker Name: Island Park

Marker Type: Roadside

Marker Text:
Island Park describes the northern part of Fremont County from the top of the Ashton Hill to the Montana border. Within its borders is an ancient volcanic caldera that has been inactive for the last 600,000 years. It is one of the largest calderas about 350 square miles. It can be seen from the top of 9,866 foot Mt. Sawtell, which is accessible by a mountain road. The radar dome is part of the air traffic control system for North America. Island Park is the home of the headwaters of the Henry’s Fork, a blue ribbon trout stream. The Henry’s Fork has two sources, Henry’s Lake and Big Springs. Big Springs produces 120 million gallons of pure water daily, enough to serve one million people. The Big Springs National Waterway begins a short way down stream from the springs. Big Springs is accessible by way of a ten-mile loop road. The Henry’s Fork is named for Andrew Henry, who came through the area in 1810 with a party of fur trappers, some who had been with Lewis and Clark’s Corps of Discovery. Island Park Reservoir is 11 miles long and is formed by a dam built in 1938 across the Henry’s Fork. It is a popular fishery for cutthroat, brook, rainbow, and hybrid trout. Boating is also popular.


County: Fremont

Group Responsible for Placement: Fort Henry Historic Byway

City: Not listed

Date Dedicated: Not listed

Marker Number: Not listed

Web link(s) for additional information: Not listed

Visit Instructions:
In your log, please say if you learned something new, and if you took any extra time to explore the area once you stopped at the historic marker waymark. If possible please post a photo of you OR your GPS at the marker location. Also if you know of any additional links not already mentioned about this bit of Idaho history please include that in your log.

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Recent Visits/Logs:
Date Logged Log User Rating  
Volcanoguy visited Island Park 9/26/2010 Volcanoguy visited it