Sunday, 20th. Passed through the Gap — came into an extensive plain, the beautiful scenery gradually receded from view — came to a creek called Horse — passed it, reached the river again — cool and windy — having come about 23 miles.
Here is William Henry Jackson’s depiction of coming “through the Gap” from the western side of Scott’s Bluff.
You can see Scott’s Bluff and Horse Creek on this map. They will soon be at Fort Laramie.