Sheep Rock Geology

Sheep Rock Geology (HM20N1)

Location: Soda Springs, ID 83276 Caribou County
Buy Idaho State flags at!
Country: United States of America
Buy United States of America flags at!

N 42° 38.861', W 111° 42.111'

  • 0 check ins
  • 0 favorites
Lava eruptions west of Sheep Rock at least 140,000 years ago blocked the Bear River from draining into the Snake River system. Instead, the Bear was forced to drain into what was then Lakes Thatcher and Bonneville to the south. The Bear River's course forms a giant horseshoe shape between its source in the high Unita Mountains of eastern Utah and where it enters the Great Salt Lake northwest of Ogden.
This high, rocky, abrupt termination of the mountain, a prominent Oregon Trail landmark, is the northern terminus of the Bear River Range, which is continuous with the Wasatch Mountains. The Bear River flows around the base of the mountains before turning south.
Just west of Sheep Rock is Alexander Crater, a basaltic cinder cone less than 20,000 years old that was mentioned in several Oregon Trail diaries. John C. Fremont, in 1843, described Alexander Crater as "a very perfectly vertical, and disposed like masonry in a very regular manner..." In recent years the crater has been mined for gravel and landscaping materials.
HM NumberHM20N1
Series This marker is part of the Oregon Trail series
Placed ByIdaho Department of Transportation
Marker ConditionNo reports yet
Date Added Friday, August 11th, 2017 at 1:01pm PDT -07:00
Sorry, but we don't have a picture of this historical marker yet. If you have a picture, please share it with us. It's simple to do. 1) Become a member. 2) Adopt this historical marker listing. 3) Upload the picture.
Locationbig map
UTM (WGS84 Datum)12T E 442467 N 4721930
Decimal Degrees42.64768333, -111.70185000
Degrees and Decimal MinutesN 42° 38.861', W 111° 42.111'
Degrees, Minutes and Seconds42° 38' 51.66" N, 111° 42' 6.6599999999998" W
Driving DirectionsGoogle Maps
Area Code(s)208
Which side of the road?Marker is on the right when traveling South
Closest Postal AddressAt or near 1501-1599 Soda Point Power Plant Rd, Soda Springs ID 83276, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

Is this marker missing? Are the coordinates wrong? Do you have additional information that you would like to share with us? If so, check in.

Nearby Markersshow on map
Check Ins  check in   |    all

Have you seen this marker? If so, check in and tell us about it.

Comments 0 comments

Maintenance Issues
  1. What historical period does the marker represent?
  2. What historical place does the marker represent?
  3. What type of marker is it?
  4. What class is the marker?
  5. What style is the marker?
  6. Does the marker have a number?
  7. What year was the marker erected?
  8. This marker needs at least one picture.
  9. Can this marker be seen from the road?
  10. Is the marker in the median?