of spelling Chinook words, but the USBGN as a matter of standardization has adopted the form shown at the head of this paragraph. This island is low, and marshy in places, which doubtless accounts for the Indian name. Maps prepared by Lewis and Clark show this and other islands nearby in the Columbia River marked marshy islands, but the expression was apparently not used as a geographic name. W. R. Broughton passed Tenasillahe Island on October 25, 1792, and describes it as a "long, sandy, shallow spit." His report on this part of the Columbia River is not entirely clear, but it may be that he camped on the island that night as he mentions "the dampness of the situation." Wilkes used the name Kathlamet for this island, a form of Cathlamet. See under CATHLAMET.
TENCENT LAKE, Harney County. This is a small lake at the extreme north end of Alvord Valley. It is fed largely by ditches, which are also its outlet. It has an elevation of about 4400 feet. It was so named because it was small and round like a dime.
TENINO CREEK, Jefferson County. This stream on Warm Springs Indian Reservation bears the name of the Tenino Indians, a Shahaptian tribe of the Columbia and Deschutes valleys. They are now classed with the Warm Springs Indians. See Handbook of American Indians, volume II, page 729. In December, 1942, J. W. Elliott, superintendent at Warm Springs Indian Agency, wrote the compiler that he had discussed with several older Indians the origin of the name. At the time of the treaty of 1855 the Teninos had as their habitat a locality on the Columbia River a few miles down stream from Celilo. This locality was known as the Tenino Fishery, and as nearly as Mr. Elliott could understand the translation, the name meant a river channel where the water was confined by steep rock walls. When the Teninos were moved to the Warm Springs Indian Reservation they took the name with them to the new location. Many of them return to the Tenino Fishery during the fishing season.
TENMILE, Douglas County. The name of the post office of Tenmile is derived from the fact that a man who lived in Happy Valley drove cattle from the valley and grazed them at the place now known as Tenmile. The distance was about ten miles, hence the name. This incident happened in pioneer days.
TENMILE CREEK, Coos County. This creek was doubtless named because it emptied into the Pacific Ocean about ten miles south of Winchester Bay, at the mouth of Umpqua River. It is also about ten miles north of the northern bend of Coos Bay, but Winchester Bav was settled earlier than any settlement on the northern part of Coos Bay, and the compiler thinks that the first explanation is the correct one. Tenmile Creek has given its name to Tenmile Lake, to Tenmile Butte, southeast of Tenmile Lake, and to North Tenmile Lake.
TENMILE CREEK, Lane County. This stream, which flows into Pacific Ocean south of Cape Perpetua, was named by surveyors because it was about ten miles long. Tenmile Ridge to the north was named for the stream.
TENMILE LAKE, Coos County. This lake was once known as Johnson Lake. The USBGN has officially named it Tenmile Lake. North Tenmile Lake is nearby. Both lakes probably received their names from Tenmile Creek, which connects Tenmile Lake with the ocean.
