Then. Most likely a 1950s image.
From Retiring Guy's postcard collection
The trees in the foreground look like American Elms.
According to a 10/17/2008 University of Wisconsin-Madison news item....
In 1851, two years after the opening of the University of Wisconsin, more than 700 elm trees were planted on the new campus, including two rows along the Bascom Hill walkways.The 'more than 700' probably doesn't include the alleged elm trees pictured above.
Now. Renovated, unobscured.