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ILLUSTRATIONS

Vista and original boundary cairn 152 on west bank of the cast crossing of the Kootenai
River --

Frontispiece
Original boundary cairn 356 east of the summit of the Rocky Mountains, now replaced by
Monument 331...

One of the earth mounds used to mark the International Boundary on the prairie in 1872-4
Instrument pier used in 1859-60 at the Senehsai latitude station on Silesia Creek
Headstone over the grave of Michael Brown, erected by the International Boundary Com-
mission, 1936, with the cooperation of the United States Army ----

Original boundary cairn 61, erected in the survey of 1858-62, now replaced by Monument
99___

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Organization camp of the boundary survey at Gateway, Montana, 1903

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Original boundary cairn 161 on the summit of the Rocky Mountains, now replaced by
Monument 272.

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The summit of the Rocky Mountains. The arrow points to boundary monument 272 in the saddle in the foreground - - -

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A difficult climb to "Kintla" triangulation station, Rocky Mountains. Commissioner
Riggs as a young surveyor in 1903.

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Climbing to a triangulation station in the Rocky Mountains.

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The boundary vista, looking east across the Flathead River valley.

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Cathedral Peak, a bald granite summit of the Cascade Mountains, just south of the

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Glacier Peak, Cascade Mountains, a triangulation station 2 miles south of the International Boundary.

A cedar log used as a bridge on the Skagit River.
Transporting the sections of an aluminum-bronze monument over a difficult bit of trail
in the Cascade Mountains.

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Tamihi Mountain, between Silesia and Middle Creeks, Cascade Mountains..
Looking northeast from Red Mountain triangulation station in the Cascade Mountains.
The prominent peak on the left is Tamihi Mountain; the boundary vista ascending
the eastern slope of the Silesia Creek valley is seen on the right...---
Looking northeast across Middle Creek from a point 1 mile northeast of boundary monu-
ment 56, Cascade Mountains..

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A high peak of the Cascade Range used as a phototopographic station, 1 mile east of
Middle Creek and 11⁄2 miles north of boundary monument 58
Triangulation station "Middle", in the Cascade Mountains, is on the high peak seen on
the left____

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A view of the summits of the Cascade Mountains, looking east across the valley of Silesia
Creek from triangulation station "Red" on the summit of Red Mountain.
Setting a cast-iron boundary monument in the prairie country

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Chief Mountain, the most easterly peak of the Rocky Mountains in the vicinity of the
International Boundary. It marks an angle point of the eastern boundary of
Glacier National Park.

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X

Fording the Souris River near the International Boundary. Note the bags on the horses'
noses to protect them from the vicious "nose flies" of the prairies

Observing from a boundary monument. Note special device for mounting the theodolite.
A bit of old Europe transplanted to Manitoba near the International Boundary.

A triangulation station tower on the Minnesota-Manitoba boundary

A Boundary Commission survey camp on the prairie east of Red River, 1912.
Boats were used for transportation on Lake of the Woods.

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A boundary line station on a cedar stump between Monuments 6 and 7-
Triangulation signal on a mountain summit where material was scarce.
Locating a range mark site in Boundary Bay, off Blaine, Washington.

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A Boundary Commission survey camp in the Cascade Mountains during a summer snow

storm.

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The Peace Portal; on the International Boundary at the crossing of the Pacific Highway on the east shore of Boundary Bay

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Original monument 53, now replaced by Monument 849, one of the cast-iron monuments
set in the Red River valley by the Commission of 1872-76_- - - -
Typical cast-iron monument used on the prairie sections of the boundary; bench-mark
post in the base..

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East Reference Monument, at the Northwesternmost Point of Lake of the Woods. Typical aluminum-bronze sectional monument used on the mountain sections of the boundary. Commissioner Ogilvie as a young surveyor in 1908____

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Monument 711-B, showing type of monument used in pairs to mark the boundary at important highway crossings.

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Monuments 165-A and 165-B set one on each side of the highway crossing the boundary at Laurier, Washington

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Monument 0 (zero) at high-water mark on the west shore of Point Roberts, Georgia
Strait...

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Monument 1, the granite monument erected on Point Roberts in 1861

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Offshore range mark on the west side of Point Roberts.

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Shore range mark, east side of Boundary Bay, and observing tower over Monument 5.
Offshore range mark, east side of Boundary Bay.

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Type of monument used for Monument 19-A..

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Lions Clubs monument, No. 832-A, near Emerson, Manitoba

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The boundary vista, looking east toward Monument 249, east of Gateway, Montana.
Topographic rodman working on horseback on the prairie

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Topographic mapping with the plane table in the Cascade Mountains.
Teams and wagons were used for transportation on the prairie __

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Old tripod at head of Northwest Angle Inlet erected by boundary survey of 1872-1876__ The boundary line east from Monument 31. The two vistas on the far ridge illustrate a great deflection of the line due to "station error" of latitude stations..

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MAPS, DRAWINGS, AND TRIANGULATION SKETCHES

Figure 1. General type cast-iron monument_

2. General type aluminum-bronze monument

3. General type concrete monument for highway crossings.

4. Special granite monument erected 1861

5. Special concrete monument with bronze post.

6. Shore range-mark tower.__.

7. Offshore range-mark tower.

8. Special concrete monument with bronze disk.......

9. Special concrete monument, inscription on base

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Map of the vicinity of the Northwesternmost Point of Lake of the Woods.
Sketch 1. Triangulation, first-order scheme, longitude 122°–125°.
2. Triangulation, first-order scheme, longitude 119°-122°
3. Triangulation, first-order scheme, longitude 116°-119°
4. Triangulation, first-order scheme, longitude 113°-116°
5. Triangulation, first-order scheme, longitude 110°-113°.
6. Triangulation, first-order scheme, longitude 107°–110°.
7. Triangulation, first-order scheme, longitude 104°-107°
8. Triangulation, first-order scheme, longitude 101°-104°.
9. Triangulation, first-order scheme, longitude 98°-101°.

10. Triangulation and traverse, first-order scheme, longitude 95°-98°
11. Triangulation, major and minor schemes, longitude 122°30′-123°20′.
12. Triangulation, major and minor schemes, longitude 121°00′-122°40′.
13. Triangulation, major and minor schemes, longitude 119°00′-121°00′.
14. Triangulation, major and minor schemes, longitude 118°00′-119°00′-
15. Triangulation, major and minor schemes, longitude 116°00'-118°00'
16. Triangulation, major and minor schemes, longitude 114°00'-116°00'
17. Triangulation, major and minor schemes, longitude 112°00'-114°00′.
18. Triangulation, major and minor schemes, longitude 110°00'-112°00'
19. Triangulation, major and minor schemes, longitude 108°00′-110°00′- - -
20. Triangulation, major and minor schemes, longitude 106°00′-108°00′. - -
21. Triangulation, major and minor schemes, longitude 105°00′-106°00′.
22. Triangulation, major and minor schemes, longitude 104°00′-105°00′.
23. Triangulation, major and minor schemes, longitude 103°00′-104°00′.
24. Triangulation, major and minor schemes, longitude 101°30′-103°00′.
25. Triangulation, major and minor schemes, longitude 100°00'-101°30'
26. Triangulation, major and minor schemes, longitude 98°30'-100°00′.
27. Triangulation, major and minor schemes, longitude 97°30′-98°30′.
28. Triangulation, major and minor schemes, longitude 97°00′-97°30'.
29. Triangulation, major and minor schemes, longitude 95°00′-97°00′-
30. Triangulation and traverse, major and minor schemes, Forty-ninth Parallel

to Northwest Angle Inlet.

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INTRODUCTION

The report herewith submitted covers the reestablishment and remonumenting of the International Boundary Line between the United States of America and the Dominion of Canada from the Gulf of Georgia (Georgia Strait) to the Northwesternmost Point of Lake of the Woods. It has been prepared in accordance with the requirements and provisions of articles VI and VII of the treaty concluded between the United States and Great Britain April 11, 1908. The report includes a complete account of the field and office work done by the Commissioners and a certified description and definition of this section of the boundary line.

The boundary line, surveyed and marked and herein described and defined, is a reestablishment of parts of the International Boundary adopted under article II of the Convention of London of 1818, under article II of the Webster-Ashburton Treaty of 1842, and under article I of the treaty of 1846. It conforms with the articles of the above treaties except as modified by articles I and II of the treaty of 1925.

The boundary begins at the eastern shore of Georgia Strait and follows the original astronomic determination of the parallel of 49° of north latitude to a point in Lake of the Woods, whence it runs north to the point in Northwest Angle Inlet of Lake of the Woods described in article I of the treaty of 1925.' The part of the line which follows the astronomic determination of the forty-ninth parallel is commonly called the 49th parallel land boundary and the north-and-south portion of it is generally referred to as the meridian boundary.

Beginning at tidewater, the line crosses the main continental divide, and extends for nearly 1,300 miles inland to the heart of the continent. The country traversed varies greatly in physical features, climate, and vegetation and so, correspondingly, varies in natural and economic resources and accessibility. These variations have had effect on the settlement and occupancy of the adjacent territory and so upon the need and method of defining and marking the boundary itself.

Historically as well as geographically the boundary from Georgia Strait to the Northwesternmost Point of Lake of the Woods is divided by the summit of the Rocky Mountains into two parts, which for convenience are referred to as "west of the summit of the Rocky Mountains" and "east of the summit of the Rocky Mountains."

The lengths of these parts of the boundary are: 49th parallel land boundary west of the summit of the Rocky Mountains, 410.2 miles; 49th parallel boundary east of the summit of the Rocky Mountains, 860.0 miles; meridian boundary, 26.7 miles; a total of 1,296.9 miles.

The border Provinces and States from west to east are the Provinces of British Columbia, Alberta, Saskatchewan, and Manitoba on the north and the States of Washington, Idaho, Montana, North Dakota, and Minnesota on the south.

Treaty of 1925, p. 11; map, p. 138.

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