All photos from the United States Geological Survey's 1907 publication "Rate of Recession of Niagara Falls" by G.K. Gilbert. 

American Falls in 1800s_then

 

American fall in 1827 from American shore Prospect Point

"AMERICAN FALL IN 1895: Photograph from Prospect Point, a few feet to the left of the view point of PI. VI I. Note that the American Fall has changed little and the Horseshoe Fall much."

 

American Fall in 1827 from Goat Island_check for photo

"AMERICAN FALL IN 1827: Copy of sketch by Capt. Basil Hall, made with camera lucida, from Goat Island."

 

American fall in 1895 from Prospect Point

“AMERICAN FALL IN 1895: Photograph from Prospect Point, a few feet to the left of the view point of PI. VI I. Note that the American Fall has changed little and the Horseshoe Fall much.”

 

American falls in 1854 or 1855

“THE AMERICAN FALL IN 1854 or 1855: From a daguerreotype. To be compared with the views on Pis, VII and VIM, but the view point is farther to the left and nearer the water.” (Terrapin Tower at rear center?)

 

American falls in 1895 from balcony

“AMERICAN FALL IN 1895: Photograph from Prospect Point, a few feet to the left of the view point of PI. VI I. Note that the American Fall has changed little and the Horseshoe Fall much.” (Third Suspension Bridge in background?)

 

Eastern part of Horseshoe Falls 1885

“EASTERN PART OF HORSESHOE FALL ABOUT 1885: Shows talus of limestone blocks. At the left, near Goat Island, there was a large rock fall in 1852.” (Wooden bridge at top left of falls?)

 

Horseshoe Fall in 1895_2

“HORSESHOE FALL IN 1895. Photograph from same point as sketch, PI. 111. The island at S is common -to the two views. Their comparison shows the recession of the fall and the change in its outline.”

 

Used in slide_Horseshoe Falls 1886

“The Horseshoe: Date of photograph, about 1886. The head of the Horseshoe curve recedes more rapidly than any other part of the cataract. The notch in its farther margin was developed after 1827.”