Lewis and Clark's White Salmon Trout: Coho
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Lewis and Clark’s White Salmon Trout: Coho Salmon or Steelhead? 200 Years of Getting it Wrong Part I: Lemhi River to Canoe Camp on Clearwater River Bill McMillan, December 15, 2016 William Clark. “A Map of Lewis and Clarks Track” from History of the Expedition under the Command of Captains Lewis and Clark, to the Sources of the Missouri, thence Across the Rocky Mountains and Down the River Columbia to the Pacific Ocean, 1814. Samuel Lewis, copyist; Samuel Harrison, engraver. Engraved map. Geography and Map Division, Library of Congress (67) http://www.loc.gov/exhibits/lewisandclark/lewis-landc.html#67 (Locations added by author) Note on the Research: The research related to the Lewis and Clark Expedition was often reliant on The Journals of the Lewis and Clark Expedition Online as edited by history professor Gary Moulton through the University of Nebraska Libraries Etext Center website (now the Center for Digital Research in the Humanities): http://lewisandclarkjournals.unl.edu/ This digital collection began in 2002 with 200 pages from the Nebraska Press edition of The Journals edited by Moulton (2002). It includes the journals of Capt. Meriwether Lewis, 2nd Lt. William Clark (considered by all on the expedition to be Capt. Clark and so used), Sgt. John Ordway, Sgt. Patrick Gass, and Pvt. Joseph Whitehouse. Since 2002, the Journals Online has been greatly broadened to include much beyond the original book to increase the available information for scholars and research. The website also includes notes below each day of the combined journal entries by the expedition members that provide names of animal and plant species and expedition locations with their references; access to drawings and maps made on the expedition as well as relevant ones of more recent origin; and other features of considerable interest related to the expedition. The Journals Online is worded in the original spellings and grammar used by each journalist that can be difficult to initially read in some instances. In the quotes used I minimally corrected each to more closely represent our modern spellings and grammar for easier reading. On August 12, 1805 Capt. Meriwether Lewis quietly exulted as he drank from a headwater spring of the Missouri River following a Shoshone trail to near the eastside crest of Lemhi Pass. One part of the expedition’s purpose was complete, exploration to the western extent of the Louisiana Purchase. Within ¾ mile of his westside descent from the Continental Divide he drank from a headwater spring whose waters flowed to the Pacific Ocean, the destination of the second part of his mission. The third, and primary, part of the mission assigned to him by President Thomas Jefferson would never be fulfilled in finding a water route to the Pacific. The mythical “Northwest Passage,” a navigable waterway between the Atlantic and Pacific, did not exist. But as he lingered at the crest, there remained some small hope that a navigable stream would soon be revealed in the valley below. If so, it would be but a 1-2 day traverse across the narrow divide between two of the continent’s greatest river basins without water travel. This hope would be short lived. Photo from: USFS/BLM Public Lands Center, Salmon, Idaho On August 13, 1805 Lewis was received with remarkable friendliness by the Lemhi Shoshone people at a fishing encampment along the Lemhi River at the eastern edge of Idaho. After being informed that the Lemhi Valley was isolated from the Pacific Ocean by mountains and a river that were both impassible, Lewis wrote with some disbelief: This was unwelcome information but I still hoped that this account had been exaggerated with a view to detain us among them. He was further hopeful after a tribal member shared a piece of freshly roasted salmon: This was the first salmon I had seen and perfectly convinced me that we were on the waters of the Pacific Ocean. Seemingly so near, how could salmon presence not suggest an ocean within relatively short travel? If a salmon made it up by water, why not a canoe going down? Although not stated, such considerations would have some logic based on the river gradients and Atlantic salmon distribution of his familiarity in Eastern North America. What was this first salmon? It could only be one of two species of anadromous fish known to be present at the Lemhi River, Chinook salmon (Ocorhynchus tshawytscha) or steelhead (Oncorhynchus mykiss) as classified today. Over the coming several days, weeks, and months, the expedition members would attempt to describe the differences in the salmonids of the Pacific. Their recorded descriptions would be puzzled over to the present day by historians and scientists. The subsequent conclusions drawn from the journals can be even more puzzling. This is particularly so regarding the salmon trout described in different ways and places by members of the Lewis and Clark Expedition, and the interpretations of the species they represented that would occur over the coming 200-plus years. On August 18th Clark set out with 11 of the expedition members to attempt to find a river route to the Pacific, or a land route of relatively easy passage. The Shoshones had not misled them. The ocean was not only distant, but getting out of the Lemhi Valley would be the most difficult feat of their entire journey, on the verge of starvation in their wandering through the Bitterroot Mountains. There would be no easy traverse of the continent, primarily by water or otherwise. Photo from: USFS/BLM Public Lands Center, Salmon, Idaho On August 21st Clark encountered a weir across the Lemhi used by the Shoshone to catch salmon. He continued downstream to the Lemhi entry to the Salmon River where the Native people were “gigging” salmon using a wooden spear with a bone point that would detach once the salmon was impaled and then held to the shaft by a line. It was here the expedition members came to learn gigging, but they continued to occasionally shoot salmon using the more familiar tool of the muzzle-loading rifle despite being less effective. Photo from: USFS/BLM Public Lands Center, Salmon, Idaho Lewis and the other men had returned back over Lemhi Pass with some Shoshones to the former camp on the Beaverhead River of Montana near where Trail Creek joined it to cache much of their equipment prior to committing to the rest of the journey to the Pacific. On August 22nd Lewis described a type of Beaverhead “trout”: Late in the evening I made the men form a bush drag, and with it in about 2 hours they caught 528 very good fish, most of them large trout. Among them I now for the first time saw ten or a dozen of a white species of trout. They are of a silvery color except on the back and head, where they are of a bluish cast. The scales are much larger than the speckled trout, but in their form position of their fins teeth mouth &c they are precisely like them. They are not generally quite as large but equally well flavored. This “white species of trout,” with large scales and potentially with few or no spots as compared to the spotted trout (likely westslope cutthroat, Oncorhyncus clarki lewisi today) remains a curiosity for which there is no sure explanation. Sgt. Ordway provides a further description: ... 2 kinds of Trout & a kind resembling Suckers. Being on the east side of the Continental Divide these should not be part of the Pacific salmonid story except that some sources consider these white (meaning silvery) trout to be “steelhead” (indicated in the Expedition Online notes for August 22, 1805). Given Ordway’s “resembling suckers,” the mountain whitefish (Prosopium williamsoni) is a possibility, but geographically steelhead they could not be. The probable error lies in the transition back and forth over Lemhi Pass in which the two Expedition leaders and their parties of explorers switched geographic locations. It could be misinterpreted that Lewis was still on the Lemhi on August 22nd. On August 26th Lewis returned to the Lemhi with his party and on the 27th both parties reunited there. At that time Sgt. Ordway indicated in his journal: Our hunters all returned towards evening had killed 4 deer and gigged 8 or 10 fine fish which we call salmon. They would weigh 7 or 8 pound each. But differ from the Salmon caught in the salt water, but the reason may be their living so far from the ocean in fresh water. Pvt. Whitehouse clarified that there may be a mix of salmon-like fish: The natives had also sent out some of their men to fish, & they were very successful. They caught a number of fish, which some call Salmon trout, & others Salmon, they weighed in general about 8 pounds, & their flesh were not so red, as the flesh of those caught in the New England States ... Our hunters all returned towards evening. They had killed 4 Deer, & 10 fine Trout or Salmon; they had killed those fish with a Wooden Gig, which is the method that the Natives use in fishing. Both men indicated that the Expedition members were fast learners with effective use of the gig method of fishing. The size of these “salmon,” or “salmon trout,” at 7-8 pounds each, suggest that they are steelhead. If these fish in late August of 1805 were indeed steelhead, it would be as close to the Continental Divide as Columbia/Snake basin steelhead are known to have natively occurred. Being about 900 miles by water from the Pacific, it would explain their having somewhat paler flesh than that of a fresh Atlantic salmon the expedition members were familiar with.