It is as Zwerg says above--all coins issued by the United States of America pursuant to the Mint Act of 1792 are legal tender for their original face value.
The American "Trade Dollar" of 1873-1885 (a spectacular failure!) was unwisely made legal tender throughout the U.S., caused many problems for folks, and was demonetized--the only U.S. coin to suffer that loss of status. However, the Mint Act of 1965 restored their legal tender status, and there it remains: all U.S. coins issued 1792-2017 are still legally usable as money at their face value.
Getting folks to accept them, as also noted above, is sometimes a bit problematic, but within my experience, common sense quickly asserts itself--the coins pass.
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As an aside, by coincidence, I was getting ready to post a little thread and had already taken the photos. Below is the toll charged in 1940 for a passenger car (of 1-5 person capacity) to cross the San Francisco--Oakland Bay Bridge (subject of your 1936 commemorative half dollar).
v.
