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The growth and performance of Pinus monticola, P. strobus, and their hybrids were investigated at several sites in northern Idaho and western Montana. At three sites in northern Idaho, two hybrid progenies were approximately twice as tall and markedly excelled corresponding P. monticola progenies (having the same female parents) in height growth at age 8 years . At one site in western Montana none of the few P. monticola, P. strobus, and hybrid progenies performed satisfactorily. All except a high-elevation P. monticola source from California were severely damaged by snow.

This paper reports the final phase of research that has determined the flammability of slash for nine species of northern Rocky Mountain conifers at three ages. Visual characteristics, rate of fire spread, and fire intensity for 5-year-old slash were studied by essentially the same methods as had been used previously on freshly cut and 1-year-old material. Final experimental burning was done in July and August 1960 on a specially prepared site in the Priest River Experimental Forest in northern Idaho.

Western white pine grows along west coast mountain ranges from Vancouver Island and the Homathko River on the adjacent mainland in British Columbia southward to the San Bernardino Mountains of southern California (13, 65, 75, 83). In the interior its range is from Quesnel Lake through the Selkirk Mountains of British Columbia southward into northern Idaho, western Montana, and northeastern Washington and also into the Blue Mountains of southeastern Washington and northeastern Oregon (13, 52, 65, 75, 83). The species attains its greatest size and reaches its best stand and commercial...

The canopy camera is a device of new design that takes wide-angle, overhead photographs of vegetation canopies, cloud cover, topographic horizons, and similar subjects. Since the entire hemisphere is photographed in a single exposure, the resulting photograph is circular, with the horizon forming the perimeter and the zenith the center. Photographs of this type provide a means of studying the relationships between canopy coverage and such things as precipitation interception, wind, evaporation, radiation, temperature, tree growth, and forage production. Coverage and distribution of the...

The Fraser Alpine Area is a rough, mountainous area that lies approximately 50 miles west of Denver, Colo., and covers approximately 134 square miles. About seven-eighths of it is above timberline, and all is within the boundaries of Arapaho National Forest, U.S. Forest Service. The land in the Area is not suitable for cultivation and has never been farmed.

The purposes of this report are twofold. First: to derive, describe, and test a number of different methods for predicting storm runoff from a Colorado Front Range watershed, and second: to relate runoff characteristics to the storm producing it. In short, to both predict and explain the runoff on the watershed in question.

Forest fire phenomena are presented through a series of motion pictures and 35 mm slides. These films have been taken by the staffs of the Southeastern, Pacific Southwest, and Intermountain Forest and Range Experiment Stations of the U. S. Forest Service and by Dr. Vincent J. Schaefer during the course of fire research activities. Both regular speed and time-lapse motion picture photographic techniques are employed. During parts of the presentation two motion picture projectors and two screens are used simultaneously to facilitate comparisons of fire behavior under various fuel and weather...

In 1937 the Fraser Experimental Forest was established in the heart of the Central Rocky Mountains near the Continental Divide 65 miles north and west of Denver. This 36-square-mile outdoor research laboratory is well suited for the study of pressing problems related to water yield from high-elevation forests and alpine areas. (Originally published in 1952; revised in 1960).

Ponderosa pine forests cover more than half of the timbered lands in Colorado. This forest zone occupies most of the Colorado Front Range, the easternmost range of the central Rocky Mountain system. Here ponderosa pine is found at elevations between 6,500 and 9,000 feet. Land features consist of ridges, mountain slopes, steep rocky canyons, foothills, narrow mountain valleys, and large openings or parks. Most soils originate from granites, which disintegrate readily and produce soils that erode easily when exposed. Soils derived from schist are next in extent but occupy considerably less...

Some of the most disastrous forest fires in North American history burned in slash left from logging and land clearing. In the era before organized fire control, the names Miramichi, Peshtigo, Hinckley, and Cloquet stand for millions of acres blackened and thousands of lives snuffed out. More recently the Half Moon Fire in Montana, the Tillamook Fire in Oregon, the Forks Fire in Washington, and the Dudley Lake Fire in Arizona, to name only a few, owed their irresistibility to the slash fuels that fed them. Over much of the West logging slash is now the most hazardous forest fuel, and it...