Montana's Clarkston Valley Helena Earthquake Damage of Schools and Churches, 1925

Montana Helena Earthquake

Photograph

Clarkston Valley earthquake photo archive documenting structural damage in southwestern Montana after the June 27, 1925 earthquake, one of the strongest recorded earthquakes in Montana before the 1959 Hebgen Lake disaster. The main shock struck near the Clarkston Valley north of Three Forks and northwest of Bozeman, caused severe damage across roughly 600 square miles, and was felt across an estimated 310,000 square miles. Brick buildings suffered heavily in Manhattan, Three Forks, Logan, and nearby communities, while cliffs shed rock, ground cracks opened, chimneys fell, and aftershocks continued through the following days. The absence of fatalities was widely noted as fortunate, since schools, churches, public buildings, and roads took the brunt of the damage rather than crowded urban districts.

Photo archive of 7 silver gelatin photos, approximately 3" x 5", Gallatin County and surrounding Montana communities, 1925. A dirt road is split by a long open fissure running down the track, recording visible ground rupture or surface cracking after the quake. Several brick school buildings show collapsed rooflines, broken cornices, damaged upper walls, and debris piled along foundations. Handwritten verso captions identify “public school Manhattan, 23 mi from Bozeman,” “High school Manhattan, 23 mi from Bozeman,” “Logan school, 19 mi from Bozeman,” “Consolidated school Three Forks, 40 mi from Bozeman,” and “Church Three Forks, 40 mi from Bozeman.” One captioned view reads “Logan School, Mont. Earthquake,” with damage visible along the roof and upper brickwork. The accompanying clipping summarizes the earthquake as measuring M6.6, notes damage in Manhattan, Three Forks, and Lombard, and describes later seismological interpretation of the Clarkston Valley fault.

The archive preserves a local record of disaster damage in rural Montana, where public schools and churches often stood as the largest masonry structures in small towns and therefore made earthquake destruction immediately visible. The 1925 Clarkston Valley event became a major reference point in Montana seismic history, later studied by J. T. Pardee for the U.S. Geological Survey and still cited in state earthquake preparedness materials. Light toning, minor handling wear, and faint soiling to versos; manuscript captions remain legible and image detail is strong. Overall in good condition.

Item #23325

Price: $385.00