BLM Cascade-Siskiyou National Monument National CASCADE SISKIYOU - Soda Mountain 6089 ft Elev. Did you know? According to local newspaper reports, nine aircraft have crashed into Pilot Rock since 1942, usually due to poor visibility and low clouds. Put simply, a “plug” is an intrusive body formed by mag a “plug” Put simply, exposed by ma which cooled underground and was later erosion. Recent Research that 25 Recent research regarding Pilot Rock suggests spot million years ago, magma oozed through a weak As a crust, but did not reach the surface. in the earth’s technically result, some geologists refer to Pilot Rock as as defined in the Monument’s a “,” but NOT “plug” proclamation. (The proclamation evidently uses However “plugs”and and “neck” interchangeably.) common is “necks” are defined, what they both have in remaining After the softer rock is eroded, the erosion. to harder volcanic structure stands up in bold relief the surrounding landscape as the blockish, irregular, columnar structure you see today. Cousins in Tower Ship Rock in New Mexico and Devil’s plugs, are considered to be volcanic necks or Wyoming which were exposed after the surrounding sedimentary rocks eroded and fell away. Human History Tan-ts’at-seniptha, people called it Takelma The “Stone Standing Up.” In 1841, an enterprising U.S. Navy lieutenant scouting a route from the Columbia River to San Francisco Bay named it for himself: we know it as Pilot Rock, Today Peak. Emmons’ a welcome landmark for weary migrants on the in the 1850s, and for travelers on I-5 Trail Applegate today. - Pilot Rock 5910 ft Elev. Visible from much of the Shasta Valley in northern and parts in northern California and parts much of the Shasta Valley from Visible the Rock serves as a friendly beacon to some five million vehicles and their the Rock serves as a friendly beacon 4310 ft Elev. on I-5 Highest elev. Rising 570 ft to an elevation of 5910 ft., Pilot Rock is perhaps the most striking feature of Cascade- elevation of 5910 ft., Pilot Rock is perhaps Rising 570 ft to an Siskyou National Monument. annually. passengers that travel the I-5 corridor of ’s , Rogue Valley, of Oregon’s Competing Theories Pilot Rock is part of the , a mountain stretching range notable for its string of volcanic peaks Lassen from British Columbia to northern California’s proclamation refers to Pilot Rock The Monument’s Peak. of a as “a volcanic plug,” describing it as “a remnant an leaving feeder vent left after a eroded away, Pilot outstanding example of the inside of a volcano.” and has Rock is composed mostly of volcanic andesite jointing created vertical faces with classic columnar sheer, by the cooling of its andesite composition. Plug or a Neck or both? in Many geologists use the terms “neck” and “plug” terchangeably, while others believe the terms apply to while others believe the terms apply terchangeably, types of volcanic structures. Some geologists different definitions of and magma to make use the different a volcanic the distinction between a volcanic “neck” and rock beneath “plug.” Magma is molten or partially molten surface. Magma collects inside a volcano’s the earth’s magma chamber before it erupts. When magma surface, the magma becomes lava breaches the earth’s and a volcano is formed. Geologists who make the distinction between volcanic necks and plugs consider a volcanic “neck” indicative of an actual volcano – a column of igneous rock formed by congelation of lava in the conduit or vent of a volcano and later exposed by the erosion of surrounding rocks. In contrast, these geologists consider a volcanic “plug” to be a structure formed by a body of magma that never the softer exterior surface. Over time, reached the earth’s leaving behind the now-cooled rocks eroded away, magma. BLM archives Monument Boundary BLM

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Trail Information Trail behind a boulder located an old road begins on The trail Trail (PCT) Crest intersects the Pacific The trail barrier. yards for about 300 0.9 miles. Follow the PCT after about for the Pilot Rock a sign and trail junction until you reach 3/4 mile hike to the it is a fairly steep trail. From there Rock. base of Pilot can be dangerous the top of Pilot Rock Climbing to this climb is of heart. Warning: and is not for the faint and dexterity are required. steep. Scrambling, care has scaled the rock before is Going with someone who recommended.

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Be prepared and be safe! cool and stereotypical Do not be fooled by Oregon’s sees Summer time in the Rogue Valley cloudy weather. little rain, with temperatures frequently reaching 100 degrees fahrenheit. a hat and sunblock to protect yourself from sun Wear good hiking shoes and carry water and exposure. Wear snacks. Hike with a buddy or let someone know where you are going and when you will return. Always bring a flashlight to give yourself the option of or hiking out after dark in the event that illness, injury, enjoyment slow you down.

Sources for this bulletin courtesy of the Medford , Bureau of Tribune, Sources for this bulletin courtesy of the Medford Mail Land Management (BLM), Geological Survey (USGS), and the National Park Service (NPS). Update: 04.08.2013

d Trail Head Directions Trail to Exit 6 I-5 south take Medford-Ashland, From Highway south, follow Old Ashland exit. Heading - Mt Rock Road 40-2E- left onto Pilot Turn 99 for 2 miles. at 2 you will cross the PCT; At mile 1 33. Stay left. The old your right. see an old quarry to miles you will as trail head parking. quarry serves vehicles with drive slowly; some road, please may not be suitable. lower ground clearance

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