AMP: 13 Location: Reserve Hwy and Dagmar Rd, Sheridan Cty No reassurance shield after S-516. AMP: 19 Location: S-258 and ND-50, Sheridan Cty A few miles later, S-258 transitions into North Dakota 50, which heads east to Grenora and beyond.  W to MT-16  E to US-85  N to S-517