70 EXPLORATION FROM A. D. 1852 To A. D. 1857. 
Black Foot Fork to St. Mary. He then passed from the Bitter Root to the Jocko, and following 
the latter to its mouth entered the valley of Clarke’s Fork, followed it to a point twelve miles 
below Lake Pend d’ Oreille, crossed to the Spokane river, and proceeded about twelve miles 
west, where he joined Captain McClellan’s party. - Thence following an Indian trail, and 
crossing the Saptin or Lewis’s Fork of the Columbia, at the mouth of the Pelouse, the party 
arrived at Walla-Walla on the 6th of November. 
On the 19th September Mr. A. W. Tinkham, leaving Lieutenant Donelson’s party at Fort 
Benton, proceeded up the valley of the Sun river to the forks of that stream, crossed the 
dividing ridge, and made a reconnaissance connecting the valley of the Blackfoot and Jocko 
rivers. 
Mr. Lander also made a reconnaissance of a route from Fort Benton westward, lying a little 
north of that of Lieutenant Donelson, and mei the mountains by what Governor Stevens 
calls Lewis and Clarke's Pass. 
Governor Stevens having concluded his Indian council at St. Mary's, directed Lieutenant 
Mullan to establish there a winter post; Mr. Tinkham to make an examination of the Maria’s 
Pass; and Dr. Suckley to descend the Bitter Root, Clarke's Fork, und Columbia in a canoe. 
He started himself with a small party, accompanied by Mr. Stanley, and proceeded down the 
Bitter Root river to the St. Regis Borgia. At the source of this stream they crossed the Bitter 
Root mountains, passed down the Coeur d'Alene river to the Spokane, and thence to Fort 
Colville, where they met Captain McClellan, and proceeded with him to Fort Walla-W alla. 
About twelve miles below Lake Pend d’ Oreille, Lieutenant Donelson had detached Lieutenant 
Arnold to connect the reconnaissance with Fort Colville. He travelled along Clarke’s Fork 
to the Mission of St. Ignatius, and crossing the river proceeded to Fort Colville; thence he 
ascended the Columbia river to the mouth of Clarke's Fork, determining its latitude by sextant 
observation to be near the 49th parallel. Returning to Fort Colville he followed the Columbia 
down to the Grande Coulée, explored it, and repaired to Fort Walla-Walla. 
Governor Stevens, Captain McClellan, Lieutenant Donelson, and Lieutenant Arnold, went 
from Walla-Walla to Puget Sound by the Columbia and Cowlitz rivers. 
Dr. Suckley performed his voyage safely. He had to make only three portages of any mag- 
nitude: one being on Clarke’s Fork, above Lake Pend d’Oreille; one at the Dalles of the 
Columbia; and the other at the Cascades. 
The party on the western division, under the command of Captain George B. McClellan, 
consisted of Lieutenant J. K. Duncan, 3d artillery, Lieutenant S. Mowry, Lieutenant H. C. 
Hodges, Mr. J. F. Minter, civil engineer, George Gibbs, geologist, and Dr. J. G. Cooper, 
` naturalist. Captain McClellan left Fort Vancouver in July, 1853. His course was in a 
` northerly direction to the Cathlapoot’l; thence in a generally east direction south of Mounts 
St. Helens and Adams; thence northwest, crossing Atahnam, Nachess, and Wenass rivers, 
up the valley of the Upper Yakima to the Yakima Pass, which was examined; thence he 
proceeded to Ketetas; thence north to the Columbia; thence up the right bank of that 
river to Fort Okinakane, on Okinakane river. The party then examined the Okinakane river 
up to the lake of that name. From Lake Okinakane river their route was nearly east to Fort 
Colville; thence nearly south to a branch of the Spokane, where they joined Governor Stevens. 
Lieutenant Sylvester Mowry examined a route leading from Wenass river in a south of east 
direction to the Dalles of the Columbia. 
 Lieutenaut Hodges joined McClellan’s party at Ketetas, having marched from Fort Steila- 
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