Capt. L. proceeded up the E. fork of Clarks river 17 ms. to the enterance of Cokahlarishkit river or the river to buffalow, he proceeded up on the North Side of this river which is 60 yards wide crossing Several Small Streams and the N. fork, and passing over part of the dividing mountain onto the waters of Deabourns river in the plains and in a Derection to the N. extremity of Easte range of rocky mountains which pass the Missouri at the pine Island Rapid. from thence he bore his Course to the N E untill he Struck Meadcin river near where that river Enters the rocky Mts. and proceeded down Medicine river to the Missouri at the white bear Islands at the upper part of the portage. this rout is a very good one tho not the most derect rout, the most derect rout would be to proceed up the Missouri above Dearborns river and take a right hand road & fall on a South branch of the Cokatlarishkit R. and proceed down that river to the main road but the best rout would be from the falls of the Missouri by fort mountain and passing the N. extremity of that range of the Rocky Mountains which pass the Missouri at the pine Island rapid Course nearly S. W. and to the gap through which the great road passeds the dividing mountain the distance from the falls to this gap about 45 miles through a tolerable leavel plain on an old indian road. and the distance from thence to Clarks river is 105 miles.