[3] Name on the Register Image Date listed[4] Location City or town Description 1 Beaverhead Rock-Lewis and Clark Expedition Beaverhead Rock-Lewis and Clark Expedition February 11, 1970 (#70000359 ) About 14 miles northeast of Dillon 45°23′18″N 112°27′29″W / 45.388333°N 112.458056°W / 45.388333; -112.458056 (Beaverhead Rock-Lewis and Clark Expedition ) Dillon 2 Dr. Don L. Byam House Dr. Don L. Byam House March 1, 2002 (#02000103 ) Main St. 45°18′27″N 111°58′04″W / 45.3075°N 111.967778°W / 45.3075; -111.967778 (Dr. Don L. Byam House ) Nevada City 3 Christ Episcopal Church and Rectory Christ Episcopal Church and Rectory January 22, 1987 (#86003672 ) 304 S. Main St. 45°27′13″N 112°11′45″W / 45.453611°N 112.195833°W / 45.453611; -112.195833 (Christ Episcopal Church and Rectory ) Sheridan 4 Doncaster Round Barn Doncaster Round Barn April 14, 2015 (#15000150 ) Riverside Dr. 45°34′12″N 112°18′49″W / 45.570118°N 112.313718°W / 45.570118; -112.313718 (Doncaster Round Barn ) Twin Bridges vicinity5 Ferris-Hermsmeyer-Fenton Ranch Ferris-Hermsmeyer-Fenton Ranch January 9, 2008 (#07001364 ) 144 Duncan District Rd. 45°26′59″N 112°14′03″W / 45.4498°N 112.2341°W / 45.4498; -112.2341 (Ferris-Hermsmeyer-Fenton Ranch ) Sheridan Ranch established by Jane Ferris, a widow, in 1872. 6 Finney House Finney House March 1, 2002 (#02000104 ) Junction of Main and California Sts. 45°18′28″N 111°58′05″W / 45.307778°N 111.968056°W / 45.307778; -111.968056 (Finney House ) Nevada City 7 Hutchins Bridge Hutchins Bridge March 18, 1999 (#99000344 ) across the Madison River 44°53′19″N 111°34′50″W / 44.888738°N 111.580618°W / 44.888738; -111.580618 (Hutchins Bridge ) Cameron vicinityTriple-span Pratt through truss bridge built in 1902. 8 Madison County Fairgrounds Madison County Fairgrounds August 3, 1984 (#84002500 ) Montana Highway 41 45°32′31″N 112°20′08″W / 45.541944°N 112.335556°W / 45.541944; -112.335556 (Madison County Fairgrounds ) Twin Bridges 9 William O'Brien House William O'Brien House October 23, 1986 (#86002933 ) 114 E. Poppleton 45°27′16″N 112°11′40″W / 45.454444°N 112.194444°W / 45.454444; -112.194444 (William O'Brien House ) Sheridan 10 Pony Historic District Pony Historic District August 4, 1987 (#87001264 ) Community of Pony, southwest of Harrison 45°39′25″N 111°53′50″W / 45.656944°N 111.897222°W / 45.656944; -111.897222 (Pony Historic District ) Pony 11 Powder House Powder House August 3, 1987 (#87001266 ) ½ mile southeast of Pony on Potosi Rd. 45°39′22″N 111°52′33″W / 45.656111°N 111.875833°W / 45.656111; -111.875833 (Powder House ) Pony 12 Robbers Roost Robbers Roost January 1, 1976 (#76001124 ) 5 miles north of Alder at Montana Highway 387A 45°23′33″N 112°08′49″W / 45.3925°N 112.146944°W / 45.3925; -112.146944 (Robbers Roost ) Alder 13 H.D. Rossiter Building H.D. Rossiter Building March 7, 1994 (#94000138 ) 115 S. Main St. 45°27′21″N 112°11′46″W / 45.455833°N 112.196111°W / 45.455833; -112.196111 (H.D. Rossiter Building ) Sheridan 14 Saint Mary of the Assumption Saint Mary of the Assumption October 24, 1985 (#85003380 ) Off Montana Highway 287 45°21′15″N 112°07′15″W / 45.354167°N 112.120833°W / 45.354167; -112.120833 (Saint Mary of the Assumption ) Laurin 15 Strawberry Mine Historic District Upload image August 4, 1987 (#87001265 ) Roughly bounded by Strawberry Ridge, Pony Rd., and Pony Creek 45°39′50″N 111°56′14″W / 45.663889°N 111.937222°W / 45.663889; -111.937222 (Strawberry Mine Historic District ) Pony 16 Thexton Ranch Upload image May 12, 2006 (#06000426 ) 335 Varney Rd. 45°16′53″N 111°45′44″W / 45.28132°N 111.76214°W / 45.28132; -111.76214 (Thexton Ranch ) Ennis 17 Union City Union City February 26, 1999 (#99000261 ) Southeast of Virginia City[5] 45°12′30″N 111°56′03″W / 45.208333°N 111.934167°W / 45.208333; -111.934167 (Union City ) Virginia City An abandoned mining camp[6] 18 Virginia City Historic District Virginia City Historic District October 15, 1966 (#66000435 ) Wallace St. 45°17′27″N 111°56′35″W / 45.290833°N 111.943056°W / 45.290833; -111.943056 (Virginia City Historic District ) Virginia City 
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