Forest Service

Documentation for a snow study by Lyle Watts in a national forest in Idaho. Back of photo reads, "4/8/31 - 3PM 5.6 - 1/10s. Bright. Effect of needles on melting snow & granulated condition of snow under OMYP." Photo #2009-2943 is similar to photo #2009-2942.

Documentation for a snow study by Lyle Watts showing a needled branch mostly covered with snow. A pencil lies beside the branch for scale. Mr. Watts measured the granulation of the snow and the effect of the needles on the rate of melting. He has the numbers 257454 at the lower right corner of the photo and may have used this to record his findings. Most of the snow studies were done in Idaho.

Documentation for a snow study by Lyle Watts showing a forest with only traces of snow remaining. The back of the photo reads, "M.C.-2-Idaha. 4/28/31 - 10AM - Stop 16. Time 1/10s. V-film. Face SE from P-1 - Joins #11." Mr. Watt's "#11" is photo 2009-2940.

Unidentified men inspect a spillway in Lind, Washington. On the back of the photo, Lyle Watts writes, "Lind, Wash. Rain of .13 inch on Jan 15, 1931 deposited 12 000 cu. ft. soil above dam filling dam to crest of spillway. Drainage area 871 acres. Soil was frozen at time of run-off. Maximum flow was 79 cu. ft. per sec."

Documentation for snow study by Lyle Watts showing most of the snow gone from among the tall trees. Back of photo written pencil reads, "SR3-Taken about May 1. Record in Ogden-" Written in pen is "all of the snow gone from plot. Just a little in dense adv. growth with no overhead crowns." Most of the snow studies were in Idaho, though this may refer to Ogden, Utah.

Documentation for a Snow Study in Idaho by Lyle Watts. Similar to 2009-2943.

Documentation of a snow study by Lyle Watts showing the snow receding. Back of the photo reads, "Idaho SR-3-about April 30. Snow on north side of trees near Grandstand."

Documentation for a snow study by Lyle Watts in a national forest in Idaho. Back of the photo reads, "4/20/31 - 2 PM - Verichrome Stop 16 Time 1/25 - Bright Sun Same as #7." #7is a numbering system Mr. Watts used on some of his photos. This is nearly the same as photo 2009-2936. The sticks in the center of the two places where the snow has melted may be yardsticks or something similar to show the amount of melting that had taken place.

Forest Documentation by Lyle Watts for a survey study probably on the Montana-Idaho border at Rock Flat showing an area of the forest where snow is melting. Back of the photo reads, "4/8/31 245pm Stop - 8 - Time 1/15 SR3 Corner 2 - Same as 7-8 on 4/2/31." His reference to "7-8" refers to his own numbering which occurs on some of his photos. This photo shows the same area as photo 2009-2918 taken six days earlier.

Forest documentation by Lyle Watts for a survey study, possibly on the Montana border at Rock Flat. The back of the photo reads, " 4PM - 4/8/31 Stop 8 - Shutter 1/6 - Hazy sun. Effect of OM Yellow Pine on snow cover."