Set out at an early hour as usual, the banks being favourable and water strong we employed the toe rope principally; river narrow and croked; country much as that of yesterday; immence number of the prickley pears  in the plains and on the hills. At the distance of 2¼ miles passed the entrance of a large Creek, affording but little water; this stream we named Blowing Fly Creek,  from the immence quantities of those insects found in this neighbourhood, they infest our meat while roasting or boiling, and we are obliged to brush them off our provision as we eat. At 11 A. M. we arrived at the entrance of a handsome bold river which discharges itself into the Missouri on the Lard. side; this stream we take to be that called by the Minnetares the [blank] or Muscleshell River; if it be the same, of which I entertain but little doubt, it takes it's rise, by their information in the 1st Chain of the Rocky Mountains at no great distance from the Yellow stone river,  from whence in it's course to this place it passes through a high and broken country pretty well timbered, particularly on it's borders, and intersperced with handsome fertile plains and medows. but from the circumstance of the same Indians informing us that we should find a well timbered country in the neighbourhood of it's mouth, I am induced to beleive that the timbered country of which they speak is similar to that we have passed for a day or two, or that in our view above, which consists of nothing more than a few scattering small scrubby pine and dwaft cedar on the summits of some of the highest hills nine tenths of the country being wholy destitute of timber of any kind, covered with a short grass, arromatic herbs and the prickley pear; the river bottom however, so far as we have explored it or 8 m. are well stocked with Cottonwood timber of tollerable size, & lands of excellent quality. We halted at thentrance of the river on the point formed by it's junction with the Missouri determining to spend the day,  make the necessary observations and send out some hunters to explore the country. The Muscle Shell river falls into the Missouri 2270 miles above it's mouth, and is 110 yards in width, it affords much more water than streams of it's width generally do below, it's courant is by no means rappid, and from appearances it might be navigated with canoes a considerable distance; it's bed is coarse sand and gravel principally with an occasion mixture of black mud; it's banks abbrupt and about 12 feet high yet never appear to overflow; the waters of this river is of a greenish yellow cast, much more transparent than the Missouri, which last is also much more transparent than below but still retains it's whiteish hue and a proportion of it's sedement. the Missouri opposite to this point is deep, gentle in it's courant, and 222 yards in width. The hunters returned this evening and informed us that the country continued much the same in appearance as that we saw where we were or broken, and that about five miles abe [NB: above] the mouth of shell river a handsome river of about fifty yards in width discharged itself into the shell river on the Stard. or upper side; this stream we called Sâh-câ-gar me-âh [NB: Sah ca gah we a] or bird woman's River, after our interpreter the Snake woman.  Shields also found a bould spring or fountain issuing from the foot of the Lard. hills about 4 miles up the Missouri; a fountain in this plain country is a great novelty; I have not seen a bould fountain of pure water except one since I left the Mandans; there [NB: are] a number of small ones but all without exception are impregnated with the salts which abound in this country, and with which I believe the Missoury itself considerably impregnated but to us in the habit of useing it not perceptible; the exception I make is a very fine fountain under the bluffs on the Lard. side of the Missouri and at a distance from the river about five miles below the entrance of the yellowstone River. The sands of the Missouri are not so abundant as they have been for some time past, being confined to the points only; the bed of the river principally mud and still too deep to use the seting pole. Capt. Clark walked out today and killed two deer and an Elk, the hunters killed 4 deer and elk and a buffaloe. I saw two large Owls  with remarkable long feathers on the sides of the head which resembled ears; I take them to be the large hooting owl tho: they are somewhat larger and their colours brighter than those common to the U' States.—
|South||Along the Stard. side to the upper part of a bluff (bad water)||½|
|S. 70° E.||to a sand point on the Stard. side||1|
|S. 20° W.||to some timber on a Stard. point||½|
|S. 10° E.||to the entrance of a large creek on Lard. 25 yds. wide, called
blowing Fly Ck.
|South||to a point of timher on the Lard. side opposite to a bluff on
|S. 30 E.||to a willow point on the Stard. side opposite to a bluff on
|South||along the Stard. point opposite to a bluff||¼|
|West||to a point of woodland on the Lard. Sd. just below which
Muscle shell R. discharges itself on the Lard. 2270 m. up
Point of Observation No. 20.
On the Lard. shore opposite to the extremity of the 5th course of this day, observed time and distance of ☉'s, and ☽'s nearest limbs, with Sextant, the ☉ East.
|h m s|
|A. M.||9 44 48||103° 3' 14"|
Longitude deduced,— [blank]
Point of Observation No. 21. 
On the point of land formed by the junction of the Missouri and Muscle Shell river observed Equal Altitudes of ☉, with Sextant.
|A. M.||9||53||31||P.M.||lost||}||Altd. of Sextant
at the time of Obst.
81° 58' 15"
|h m s|
|Chronometer too [blank] on Mean time||[blank]|
Observed Meridian Altd. of ☉'s L. L. with Octant by the back observation 59° 50'
Latitude deduced from this Observation 47° 00' 24.6"
Observed also magnetic Azimuth of ☉'s Center.
|h m s|
|1st S. 85 W.||A. M. 6 14 35||50° —' —"|
|2cd S. 82 W.||" 6 24 36||46 37 30|
|3rd S. 80 W.||" 6 34 42||43 15 30|
The variation of the magnetical needle. [blank]
a fine morning wind from the N E. river falling a little We Set out at 7 oClock and proceeded on verry well as usial by the assistance of the Cord passed Some verry Swift water, river narrow and Crooked, at 11 oClock arrived at the mouth of Shell river on the Lard Side and formed a Camp for the present. haveing passed a large Creek about 4 miles below on the Ld Side which we call Blowing fly Creek from the emence quantites of those insects which geather on our meat in Such numbers that we are oblige to brush them off what we eate.
muscle Shell River falls in on Lard Side 2270 miles up Contains a greater perportion of water than Rivers of its Size below, I measured it and find it to be 110 yards wide, the water of a Greenish yellow Colour, and appers to be navagable for Small Craft, The Minetarras inform us that this river heads in the 1st of the rockey Mountains & passes through a broken Countrey. its head at no great distance from the Yellow Stone River The Countrey about this river as described yesterday we took the Meredian altitude 59° 50' 0" back observation and found the Latd. to be 47° 0' 24"
〈The Distance of the Moon's Western Limb〉
Observed time & Distance of Sun & Moons nearest limbs the Sun East
|h m s|
|A. M.||9 39 17||103° 5' 15"|
|" 40 26||103 4 45|
|" 41 17||" 4 15|
|" 42 45||" 4 0|
|" 44 0||" 3 30|
|" 45 2||" 3 15|
|" 45 50||" 3 0|
|" 46 51||" 2 0|
|" 47 53||" 2 0|
|" 48 57||" 1 45|
|" 50 22||" 1 30|
|h m s|
|Cronometer too fast mean time||[blank]|
observed Equal altitudes with Sextent
|H||M||S||}||altitude produced from this observation is 81° 58' 15"|
Took the Magnetick azmoth of the Sun
|h m s|
|P M||S 85° W||6 14 35||50° 00' 00"|
|S 85° W||6 19 31||48 20 15|
|S 82° W||6 24 38||46 37 30|
|S 80° W||6 34 42||43 15 30|
The Missouri at the mouth of Shell River is 222 yards wide with a Smoth Current the Missouri water is not So muddey as below, but retains nearly its usial Cholour, and the Sands principally Confined to the points I killed two Deer & an Elk, the hunters killed an Elk & Several deer mearly for their Skins to make Leagins,— Sent men out in every derection, the Countrey generally verry broken Some leavel plains up the Shell river The bottoms of the Shell river is well timbered as also a Small river which falls into that river on the upper Side 5 miles above its mouth. The hills on the Lard. Contain Scattering Pine & Cedar.
|mile||Course & Distance May 20th 1805|
|South||½||allong the Stard. Side to the upper part of a Bluff (bad
|S. 70° E||1||to Sand point on the Stard. Side|
|S. 20° W||½||to the timber on the Stard. point|
|S. 10° E||¼||to the enterence of a large Creek Lard Side|
|South||1 ¼||to the point of timber on the Lard Side opposit a Bluff S. S.|
|S. 30° E||1 ¼||to a willow point on the Stard Side opposit a bluff on the
|South||¼||allong the Std. Point opsd. a bluff|
|West||2||to a point of wood land on the Lard. Side below which the
mouth of Shell river falls in on the Lard. Side 2270 up
Monday 20th May 1805. a clear pleasant morning. we Set off as usal. one of the hunters or trapers caught a large beaver last night. about nine oClock A. M. we passed the mouth of a large Creek  on the S. Side & a handsom bottom of C. wood timber. proceeded on passed pitch pine & ceeder hills on each Side of the River. the river narrow and crooked  at 11 oClock we arived at the mouth of Shell River on the Lard Side and formed a Camp for the present. the large Creek which we passed about 4 miles below on the Lard. Side we Call Blowing fly Creek from the emence quantities of those insect which geather on our meat in Such nombers that we are obledged to brush them off what we eate Mussel Shell River falls in on Lard. Side 2270 miles up contains a greater perportion of water than River of its Size below. Capt. Clark measured it and found it to be 110 yards wide. the water of a greenish yallow coulour and appears to be navagable for Small crafts, the natives Inform us that this river heads in the 1st rocky mountains & passes through a broken Country. its head at no great distance from the Yallow Stone river the Country about this river as described yesterday. our Captains took the Meridian altitude and found the Latd. to be 47° 0 24" the Missourie at the mouth of Shell River is 222 yds wide with a Small current. the Missourie water is not So muddy as below but retains nearly the usal colour. and the Sands principily confined to the points. Capt. Clark killed two Deer and an Elk. the hunters killed Several Elk and Several Deer, mearly for the Skins to make Leagins [and moccasons?] &.c. Some men was Sent out in [every?] Direction the Country generally verry broken Some level plains up the Shell river. the bottoms of the Shell River is well timberd as also a Small river  which falls into that river on the upper Side 5 miles abo. its mouth the hills on the Lard. Side contain Scattering Pine and ceeder but of no great value. Small & Scrubby.— (Came 7 miles to day)
Monday 20th. We set sail early and had a fine morning. Passed a creek on the south side  and about 11 came to the mouth of the Muscle-shell river, a handsome river that comes in on the South side. The water of the Missouri is becoming more clear. We here spent the remainder of the day, having come seven miles. Captain Lewis had an observation here, which gave 47° 00 24 North latitude: and Captain Clarke measured the rivers. The Missouri here is 222 yards wide, and the Muscle-shell 110 yards. The water of the latter is of a pale colour, and the current is not rapid; its mouth is 660 miles above Fort Mandans.
Monday 20th May 1805. a clear pleasant morning. we Set off as usal. one of the hunters caught a beaver last night. abt. nine oC. we passed the mouth of a Creek on the S. S. and a handsom bottom of C. wood timber. one of the hunters killed a Deer another killed a beaver. we proceeded on passed pitch pine & ceeder hills on each Side River. about 11 oClock, we arived at the mouth of Mussell Shell River on the S. S. this River is 110 yards wide and the Missourie 222 yards wide at this place, and 2271 miles from the mouth of the Missourie River. we encamped here on the point between the 2 rivers which is a large bottom covered with C. wood timber. we delayed here all day for observations &c. found the latitude 47° 24" North. the hunters killed at this place Eight Deer 4 Elk one woolf—and remained here all the afternoon & Camped for the night 2 men Stayed out hunting beaver all night. we came only 6 miles this morning.
Monday May 20th A Clear pleasant morning, we set off as usual, One of the hunters during last night caught a beaver; about 9 oClock A. M. We passed the Mouth of a Creek lying on the North side of the River, and a handsome bottom of Cotton Wood timber lying on the same side; We proceeded on our Voyage at about 11 o'Clock A. M. We arrived at the Mouth of a River named by our Officers Muscle shell River, lying on the South Side of the Mesouri, this River is 110 Yards wide at its mouth, and the Mesouri River; at this place 222 Yards wide; and the distance from the Mouth of the Mesouri River, to the Mouth of Muscle shell River 2,271 Miles We took up Camp here, on a point situated between these two Rivers, in a large bottom Cover'd with Cotton wood, we halted here this day, Our Officers intending to ascertain the Latitude of this place, which they compleated and found it to lay in Latitude 47° 22" North,—
The party that went out a hunting returned to us here, having killed 9 deer, one beaver, one Elk and one wolf Two of our hunters went out this night, and stayed out all night to trap beaver.— We came 6 Miles this morning—