62 SURVEY OF IDAHO-MONTANA BOUNDARY LINE. [bull. no. 
From the foregoing list it appeared that the Mooyie Trail monu- 
ment was the point on the international boundary nearest the Idaho- 
Montana boundary line, and Mr. Perkins was instructed to make a 
search for it. The monument is about 32 miles from Bonners Ferry, 
Idaho, and is easily reached by the new Wild Horse trail. It is on 
the west side of and near the trail between Round Meadows hay ranch, 
or Walters Prairie, and Mooyie River, and about 5 miles from the 
former. It is about a half mile beyond a section of the trail which 
for a distance of about one-fourth mile is filled with loose rock. As 
the monument is approached the trail passes through a heavy growth 
of timber and underbrush. The monument consists of a large pile of 
partly angular rocks, now knocked down by fallen trees. Originally, 
the trees in the immediate vicinity of the monument were cut down. 
It will be observed that the latitude for the Mooyie Trail monu- 
ment given in the list signed by the officers of the United States and 
British commissions is 49° 00' 01". 3, or 1".3 (about 132 feet) north of 
the parallel constituting the international boundary, and it was sup- 
posed that the point marked by the monument was in that latitude, 
and therefore not exactly on the international boundary. During the 
field season of 1898 the triangulation was extended so as to locate 
this monument, and its position deduced from the Spokane base is 
as follows: Latitude, 49° 00' 01". 51; longitude, 116° 14' 19".48. 
The check in latitude, 21 feet, was considered very satisfactory, 
and even the discrepancy in longitude, about 2,647 feet, was not 
more than might be expected, considering the lack of telegraphic 
facilities at the time of the Northwest Boundary survey. The point 
determined as the true one for the intersection of the international 
boundary and the Idaho-Montana boundary line was located with 
reference to the Mooyie Trail monument, so that there need be no 
large discrepancy, except that due to station error, when the inter- 
national boundary is ultimately traced and marked, it being assumed 
that the work already done by the Northwest Boundary survey will 
be accepted and utilized. 
The distance from the point on the Idaho-Montana boundary line 
at the crest of the Bitterroot Mountains to the international boundary, 
used in placing the initial monument, was computed as follows, the 
constants being taken from United States Coast and Geodetic Survey 
Report, 1884, Appendix No. 6 : 
Latitude. 
Transit station, crest of Bitterroot Mountains 47 58 35.56 
International parallel 49 0.00 
Difference.. ... 1 01 24.44 
