I've been following the Lassen thread with great admiration for the knowledge displayed by the various contributors. By coincidence, I just found a brief article which appeared exactly 146 years ago today:

"A Masonic Committee from San Francisco, says the Shasta Courier, have gone to Black Rock for the purpose of exhuming the remains of Peter Lassen, who, it will be remembered, was killed by the Indians last summer. He was a charter member of "Western Star Lodge No 2," of Shasta."

"Meeting of Emigrants - The New Road
We have received a report of a meeting held by the late emigration from the United States, in conjunction with a wagon party from Oregon, traveling into California, upon their arrival in Sacramento valley, on the 31st October [1848].
The meeting appears to have been called with an object to obtain an expression of opinion relative to the new route taken this reason by the emigrants, headed by Mr. Lawson, across the mountains of California. A committee was appointed, and a report made, of which the following is an extract:-
'We found the ascent and descent to and from the mountain, very gradual and even, and upon the whole your committee considered the pass discovered by Capt. Law[s]on, one of the finest in the world, through mountains so extensive as the one through which it passed. In the opinion of your committee, a most practicable road can be made, with very little labor through this pass; and that this route will prove of lasting benefit to parties traveling to and from Oregon and California, and to the United States, as it has proved to us.'" --Milwaukee Sentinel and Gazette, February 27, 1849, p. 2, c. 2 (The Sentinel may have been reprinted this from the California Star; if so it's probably already familiar to the Lassen experts.)

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"We have news from the Plains by persons who crossed the Sierra Nevada on the 15th inst., having left the Missouri River on the 21st June. This party came in the rear of the great Spring emigration to California and suffered from the loss of animals and outfits, because of the great scarcity of forage on all the travelled routes.
These persons represent that the emigration had about reached the foot of the mountains on the Carson route by the sink of Mary's River; and that near the summit of the range on this road they met relief trains going forward to those who might need assistance. Most of the belated emigration were induced, by representations on the way, to take the Lawson route, which diverges to the north, on the right about 80 miles above the sink of Mary's River; but subsequent information says that they have taken the most difficult road, and will be from one to two weeks later arriving at the settlements.
There has been a great deal of trouble, loss and toil from losing teams, &c., on the way, but the people were pretty well provided with provisions, and there are no particular maladies among them, with the exception of slight scorbutic symptoms among some of the trains. We neglected to say above, that relief has been sent to the Lawson route, and that there is no apprehension of any serious calamity befalling any person or party on that road.
On the 13th inst., it commenced snowing on the Sierra Nevada mountains, for the first time during this season. It fell to about the depth of eight inches." --Huron Reflector (Norwalk, Ohio), December 11, 1849, p. 5, c. 4

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"Overland Emigrants. It appears that all the overland emigrating parties have reached California, by the aid of the Government troops, who were despatched with provisions, &c., to assist them in getting in. There has been a vast amount of suffering amongst them. Hundreds of them, including men, women and children, waded through the snow 4 and 5 feet in depth and suffered greatly; living on their cattle which had been starved and frozen to death. Among other females were the wife and daughter of Gen. Wilson, of Missouri, who came the 15 or 20 miles on foot through snow or deep mud to Lawson's Fort - their horses having fell dead on the road." --Adams Sentinel (Gettysburg, Pennsylvaniia), February 18, 1850, p. 8, c. 6

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"From California." Letter by V. R. Smith to Dear Wife, dated Feather River, Nov. 24th, 1849: "After a long and tedious journey I arrived at Lawson's Ranch in the Sacramento valley, on the 2nd day of Oct, just six months from the time I left the Missouri River... here I stopped to recruit 15 days, gave $1 50 per meal. The fresh meat and grapes cured me up directly." --Defiance Democrat (Defiance, Ohio), February 23, 1850, p. 2, c. 4