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this Creek, So great a no of Salt Springs are on it that the water is brackish N 51° W to a Belge of an Isd on the S. Sd. at 3 ms. Passed a Willow Isd. in Middle, Some wind in the after part of to day from the S E, (the Banks are falling in greatly in this part of the river) as also is one Side or the other in all the Course, we assended on the North Side of the Isd. and finding that the perogues Could not Keep up Camped 2 hs. by Sun. on the Sd Sd the land below this is good.
[Clark, June 6, 1804] June 6th Wednesday 1804 Mended our Mast this morning &, Set out at 7 oClock under a jentle breise from S. E. by S passed the large Island, and a Creek Called Split rock Creek at 5 ms. on the S. S. psd. a place to the rock from which 20 yds we. this Creek takes its name, a projecting rock with a hole thro a point of the rock, at 8 ms. passed the mouth of a Creek Called Saline or Salt R on the L. Sd. this River is about 30 yds. wide, and has So many Licks & Salt Springs on its banks that the Water of the Creek is Brackish, one Verry large Lick is 9 ms. up on the left Side the water of the Spring in this Lick is Strong as one bushel of the water is said to make 7 lb. of good Salt passed a large Isd. & Several Small ones, the water excessivly Strong, So much So that we Camped Sooner than the usial time to waite for the pirogue, The banks are falling in Verry much to day river rose last night a foot.
Capt. Lewis took meridean altd. of Suns U. L. with the octant above Split Rock C. &made the altitude 37° 6' 00 error of octt. as useal 2° 0' 0" + The Countrey for Several miles below is good, on the top of the high land back is also tolerable land Some buffalow Sign to day
I am Still verry unwell with a Sore throat & head ake
[Clark, June 7, 1804] Thursday 7th of June 1804 Set out early passed the head of the Isd from the Isd. N. 61° W. to the mouth of a Creek Called big monitu on St. Sd. 41/2 ms. psd. a Sand bar in the river, Som Buffalow Sign Sent out George Drewy