Santa Rita Experimental Range
Repeat Photography

Photo Station #150

Photo Archive No. 150.1.1937.08

Perm. No. 357827. C-112. Mesquite Plot. Photo Sta. 150. Plot 108A. Fork in small gully. A small amount of Feathergrass and Aristida show which antecede the clearing. The gully already shows the first signs of healing. 8/11/37. 5x7. 400-D. S.A. 108.

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Photo Archive No. 150.1.2000.11

PS 150. November 13, 2000, 2:30 p.m. Facing east. Azimuth 105. Pasture 3. ASA 125 Plus X film. 35mm lens focal length. Matches 1937 photo. Burroweed dominates; some snakeweed. Muhlenbergia porteri and Digitaria californica under mesquites. Channel is active. M. McClaran.

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Photo Archive No. 150.1.2007.03

PS. 150. 12 March 2007. Facing east, Azimuth 105. Pasture 3. Elevation 1008 m. ISO 100, 35mm focal length, Canon 5D Digital Camera. Witness post present, camera 3 m east of witness and 1.6 m height, vertical exposure. Mesquite alive. Snakeweed at base of small mesquite. Grasses in wash: cane beardgrass, cottontop, Lehmann lovegrass. Many dead burroweed on wash slopes. Zinnia above slopes. Prickly pear and cholla cacti. Desert broom under large mesquite at right distant. Chloris, threeawns and pappus grass scattered. Compared to 2000, more grass mass in wash, and less burroweed. M. McClaran photographer, no assistant.

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Photo Archive No. 150.1.2011.03

PS. 150. 15 March 2011. 3:00 PM. Facing east, Azimuth 90. Pasture 3. Elevation 995 m. ISO 100, 35mm focal length, Canon 5D Mark II Digital Camera. Witness post present, camera 3 m east of witness and 1.6 m height, vertical exposure. Mesquite alive. Grasses in wash: cane beardgrass, cottontop, bush muhly, Lehmann lovegrass, and threeawns. Prickly pear and cholla cacti. Compared to 2007, snakeweed at base of small mesquite, more grass mass in wash, no Zinnia above wash, and less burroweed, no desert broom under mesquite at right, prickly pear in midground is dead, prickly pear in foreground in good condition . M. McClaran photographer, A. Dalke assistant.

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Photo Archive No. 150.1.2017.03

PS. 150. 15 March 2017. 2:30 PM. Facing east, Azimuth 105. Pasture 3. Elevation 995 m. ISO 160, 35mm focal length, Canon 5D Mark II Digital Camera. Witness post present, camera 3 m east of witness and ~1.0 m height but no marker beneath camera, vertical format. Mesquite alive. Snakeweed and burroweed present. Grasses in wash: cane beardgrass, cottontop, bush muhly, Lehmann lovegrass, Setaria, Sporobolus, black grama, and threeawns. Prickly pear and cholla cacti. Since 2011, more burroweed plants outside of wash; more grass plants and richness inside wash; several inches of soils eroded from side of wash leaving smalls rock on pedestals; greater mass of prickly pear in wash, but dead prickly pear under mesquite top left. M. McClaran photographer, K. Hawkes assistant.

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Photo Archive No. 150.1.2023.03

PS. 150. 07 March 2023. 3:15 PM. Facing east, Azimuth 105. Pasture 3. Elevation 995 m. ISO 250, 35mm focal length, Canon 5D Mark II Digital Camera. Witness post present, camera 3 m east of witness and ~1.0 m height but no marker beneath camera, vertical format. This view matches the original 1937 image in vertical format. Mesquite alive. Snakeweed and burroweed present. Grasses in wash: cottontop, bush muhly, Lehmann lovegrass, Sporobolus, and threeawns. In the wash, cholla cacti. Compared to 2017, larger burroweed and snakeweed plants outside of wash; more grass plants outside wash, especially cottontop; several inches of soils eroded from side of wash leaving smalls rock on pedestals; prickly pear dead near foreground mesquite base; prickly pear in wash, but dead prickly pear under mesquite top left. M. McClaran photographer, A. Gorlier assistant.

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Photo Archive No. 150.2.1960.04

T-219. 15 Apr 60. SRER, P.S. 150. 10H3b. Not exact field of view as in earlier photo.

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Photo Archive No. 150.2.2000.11

PS 150. November 13, 2000, 2:30 p.m. Facing east. Pasture 3. ASA 125 Plus X film. 35mm lens focal length. Matches 1960 photo. M. McClaran.

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Photo Archive No. 150.2.2007.03

PS. 150. 12 March 2007. Facing east, Azimuth 105. Pasture 3. Elevation 1008 m. ISO 100, 35mm focal length, Canon 5D Digital Camera. Witness post present, camera 3 m east of witness and 1.6 m height, horizontal exposure. Mesquite alive. Snakeweed at base of small mesquite. Grasses in wash: cane beardgrass, cottontop, Lehmann lovegrass. Many dead burroweed on wash slopes. Zinnia above slopes. Prickly pear and cholla cacti. Desert broom under large mesquite at right distant. Chloris, threeawns and pappus grass scattered. Compared to 2000, more grass mass in wash, and less burroweed. M. McClaran photographer, no assistant.

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Photo Archive No. 150.2.2011.03

PS. 150. 15 March 2011. 3:00 PM. Facing east, Azimuth 90. Pasture 3. Elevation 995 m. ISO 100, 35mm focal length, Canon 5D Mark II Digital Camera. Witness post present, camera 3 m east of witness and 1.6 m height, horizontal exposure. Mesquite alive. Grasses in wash: cane beardgrass, cottontop, bush muhly, Lehmann lovegrass, and threeawns. Prickly pear and cholla cacti. Compared to 2007, snakeweed at base of small mesquite, more grass mass in wash, no Zinnia above wash, and less burroweed, no desert broom under mesquite at right, prickly pear in midground is dead, prickly pear in foreground in good condition . M. McClaran photographer, A. Dalke assistant.

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Photo Archive No. 150.2.2017.03

PS. 150. 15 March 2017. 2:35 PM. Facing east, Azimuth 105. Pasture 3. Elevation 995 m. ISO 100, 35mm focal length, Canon 5D Mark II Digital Camera. Witness post present, camera 3 m east of witness and ~1.0 m height but no marker beneath camera, horizontal format. Mesquite alive. Snakeweed and burroweed present. Grasses in wash: cane beardgrass, cottontop, bush muhly, Lehmann lovegrass, Setaria, Sporobolus, black grama, and threeawns. Prickly pear and cholla cacti. Since 2011, more burroweed plants outside of wash; more grass plants and richness inside wash; several inches of soils eroded from side of wash leaving smalls rock on pedestals; greater mass of prickly pear in wash, but dead prickly pear under mesquite top left. M. McClaran photographer, K. Hawkes assistant.

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Photo Archive No. 150.2.2023.03

PS. 150. 07 March 2023. 3:18 PM. Facing east, Azimuth 105. Pasture 3. Elevation 995 m. ISO 250, 35mm focal length, Canon 5D Mark II Digital Camera. Witness post present, camera 3 m east of witness and ~1.0 m height but no marker beneath camera, horizontal format. This view matches the original 1937 image, but in horizontal format. Mesquite alive. Snakeweed and burroweed present. Grasses in wash: cottontop, bush muhly, Lehmann lovegrass, Sporobolus, and threeawns. In the wash, cholla cacti. Compared to 2017, larger burroweed and snakeweed plants outside of wash; more grass plants outside wash, especially cottontop; several inches of soils eroded from side of wash leaving smalls rock on pedestals; prickly pear dead near foreground mesquite base; prickly pear in wash, but dead prickly pear under mesquite top left. M. McClaran photographer, A. Gorlier assistant.

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Photo Archive No. 150.3.1987.07

PS 150. Azimuth 105. July 8, 1987. RFB. Canon AE-1 camera. 35mm WA lens. Robert F. Buttery. Taken 10' from PS on Az 285 for better view.

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Photo Archive No. 150.3.2000.11

PS 150. November 13, 2000, 2:30 p.m. Facing east. Pasture 3. ASA 125 Plus X film. 35mm lens focal length. Matches 1987 photo. M. McClaran.

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Photo Archive No. 150.3.2007.03

PS. 150. 12 March 2007. Facing east, Azimuth 105. Pasture 3. Elevation 1008 m. ISO 100, 35mm focal length, Canon 5D Digital Camera. Witness post present, camera 4 m west of witness. Mesquite alive. Prickly pear, and barrel cacti. Little leaf Baccharis and prickly pear next to witness. Stinkgrass (Eragrostis cilianensis) present under mesquite with bush muhly. Compared to 2000, much less burroweed. M. McClaran photographer, no assistant.

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Photo Archive No. 150.3.2011.03

PS. 150. 15 March 2011. 3:20 PM. Facing east, Azimuth 90. Pasture 3. Elevation 995 m. ISO 100, 35mm focal length, Canon 5D Mark II Digital Camera. Witness post present, camera 4 m west of witness. Mesquite alive. Prickly pear, and barrel cacti present. Bush muhly present under mesquite. Compared to 2007, little leaf Baccharis is dead near witness post, stinkgrass not present, perennial grass largely unchanged but appears less because recent grazing (last month) defoliated most plants. M. McClaran photographer, A. Dalke assistant.

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Photo Archive No. 150.3.2017.03

PS. 150. 15 March 2017. 2:45 PM. Facing east, Azimuth 90. Pasture 3. Elevation 995 m. ISO 160, 35mm focal length, Canon 5D Mark II Digital Camera. Witness post present, camera 4 m west of witness. Mesquite alive, and new branches in the few have mistletoe seeds germinating. Under front mesquite find Zinnia and burroweed; and snakeweed under far right mesquite. Prickly pear, and barrel cacti present. Bush muhly present under mesquite. Since 2011, erosion has pedestalled small rock on bank of wash; increase in burroweed density and mass; decline of prickly pear density and mass. M. McClaran photographer, K. Hawkes assistant.

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Photo Archive No. 150.3.2023.03

PS. 150. 07 March 2023. 2:45 PM. Facing east, Azimuth 90. Pasture 3. Elevation 995 m. ISO 250, 35mm focal length, Canon 5D Mark II Digital Camera. Witness post present, camera 4 m west of witness. This view matches the 1960 and 1987 retakes. Mesquite alive. Under front mesquite find Zinnia and burroweed, snakeweed and Baccharis. Prickly pear present. Bush muhly and Lehmann lovegrass present under mesquite. Compared to 2017, there was an increase in cover and mass of burroweed, snakeweed, and prickly pear; lost barrel cactus; added Baccharis and Lehmann lovegrass. M. McClaran photographer, A. Gorlier assistant.

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