249:, referred to the highest peak in the Tobacco Roots as "Jefferson Peak, locally called Old Hollowtop." Since that time the more northerly, and higher, of the two adjacent peaks has usually been called Hollowtop. This naming convention is easily explained upon viewing the dish-shaped northeasterly-trending glacial cirque that occupies the top of Hollowtop peak. Information is scanty before 1914. Peale (1896) referred to Ward Peak, near Pony, and “unnamed high peaks” in the range. Present local terminology places Ward Peak further south, near McAlister. The idea that Lewis and Clark named the ranges along with the rivers cannot be confirmed.
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Apparently no peak has an elevation of 10,740’, and all sources agree that the JEFFERSON triangulation station is on the southern peak. Decades of use would have “Hollowtop” to the north, and perhaps the newer maps reflect this usage. The northern peak is labeled “Hollowtop” and “Hollow Top” on
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In 1987, the
Interagency Visitors Map of Southwest Montana (produced by the Forest Service, USGS, and State of Montana) shows the northern peak labeled Hollowtop Mtn. (10,604’), and the southern peak is marked Mt. Jefferson and includes the control station label. This is the first map known that
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Oil
Company highway maps from the late 1960s and early 1970s show Hollowtop Mtn. at 10,740’, while the Official Montana Highway Map, from at least 1971 onwards, has Hollow Top Mtn. at 10,604’. As recently as 1976, the Beaverhead National Forest map showed Mt. Jefferson to the north (10,604’) and
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Reid in 1957 mapped the northern peak as Mt. Jefferson and the southern one as Goat
Mountain. In 1960, the Waterloo 15-minute topographic quad showed Mt. Jefferson, to the north, at 10,604’, and the southern one as Hollowtop Mtn (10,513’) with the JEFFERSON control station label. In 1976, the
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Finally, the 1989 7½-minute quad (Noble Peak) also shows
Hollowtop Mountain (10,604’) to the north, with Mt. Jefferson (10,513’) to the south with the control station. Numerous hand-held GPS measurements indicate that these listed elevations are probably accurate.
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Some earlier, published maps labeled the northern peak as Mt. Jefferson. Confusion may arise from the fact that the horizontal triangulation control station (VABM) named JEFFERSON is located on the southern peak, and this designation is found on many maps.
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map shows Mt. Jefferson to the north at 10,604’ and the JEFFERSON control station to the south at 10,740’, while the 1970 Deerlodge
National Forest map is similar, but with the name Hollowtop Mtn. and no elevation for the southern peak.
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stated that this was the correct designation. The 1962 Dillon Quad (1:250,000) labeled the northern peak Hollow Top Mt., and the other one had no designation other than the triangular control station mark. The 1963
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is an adjacent, taller peak less than .75 miles (1.2 km) to the north. Over the years, the two summits have had numerous names and elevations recorded on various maps. According to
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map dodged the issue: the northern peak received two designations — Hollowtop Mtn. and Mt. Jefferson. The southern peak was labeled with the JEFFERSON control station only.
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map of 1937, with an erroneous (but long-perpetuated) elevation of 10,740’ given. The southern peak was called Hollow Top
Mountain, at 10,513’. The next year, 1938, the
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In 1933, Tansley and others referred to the high point of the range as Mt. Jefferson, at 10,600 ft. The northern peak was labeled Mt. Jefferson on the
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topographic maps, Mount
Jefferson is 10,513 ft (3,204 m), while Hollowtop Mountain to the north is 10,604 ft (3,232 m).
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The nomenclature for Mount
Jefferson has seen considerable change and confusion over the years. A.N. Winchell, in his 1914 report,
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Bedrock geology of the north end of the
Tobacco Root Mountains, Madison County, Montana
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Period. The
Tobacco Root Batholith is often called a satellite of the much larger
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A geologic reconnaissance of the Tobacco Root Mountains, Madison County, Montana
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The bowl-like crest of Hollowtop, best viewed from the towns of
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Hollowtop Mtn. with the JEFFERSON control station to the south.
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Peale, A.C., 1896, Three Forks Folio, U.S. Geological Survey
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shows both names, with Hollowtop north of Mt. Jefferson.
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in Montana, further south, on the Idaho/Montana border.)
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various maps, with a single word somewhat more common.
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Most of the mountain is underlain by the Tobacco Root
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432:Tansley, W., Schafer, P.A., and Hart, L.H., 1933,
217:, and is one of the many 10,000+ ft peaks in the
400:"Mount Jefferson, USGS Noble Peak (MT) Topo Map"
429:: Montana Bureau of Mines and Geology Memoir 36
310:intruded about 75 million years ago during the
19:For other mountains named Mount Jefferson, see
436:: Montana Bureau of Mines and Geology Memoir 9
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318:. Parts of Mt. Jefferson-Hollowtop contain
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441:Mining Districts of the Dillon Quadrangle
247:Mining Districts of the Dillon Quadrangle
343:to the east, is not a classical glacial
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458:Mountains of Madison County, Montana
223:Beaverhead-Deerlodge National Forest
351:, but scouring typical of a moving
21:List of peaks named Mount Jefferson
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16:Mountain in the state of Montana
270:U.S. Board on Geographic Names
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221:. The mountain is located in
56:10,513 ft (3,204 m)
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376:"Mount Jefferson, Montana"
275:Beaverhead National Forest
40:Mt Jefferson and Hollowtop
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262:Deerlodge National Forest
225:. (There is also another
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258:Gallatin National Forest
66:393 ft (120 m)
142:Madison County, Montana
439:Winchell, A.N., 1914,
235:U.S. Geological Survey
219:Tobacco Root Mountains
94:45.60278°N 112.00583°W
468:Mountains of Montana
99:45.60278; -112.00583
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463:Geology of Montana
425:Reid, R.R., 1957,
231:Hollowtop Mountain
46:Highest point
341:Harrison, Montana
323:metamorphic rocks
316:Boulder Batholith
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241:Nomenclature
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165:Tobacco Root
159:Parent range
405:. TopoQuest
97: /
85:112°00′21″W
72:Coordinates
452:Categories
409:2008-06-29
385:2010-04-13
359:References
211:U.S. state
82:45°36′10″N
62:Prominence
304:Batholith
110:Geography
52:Elevation
327:patented
207:mountain
184:Climbing
172:Topo map
353:glacier
349:ice age
320:Archean
308:granite
298:Geology
215:Montana
209:in the
345:cirque
403:(Map)
205:is a
339:and
196:Hike
177:USGS
146:U.S.
213:of
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