An Arkansas man is missing after he never returned from a hike at the Buffalo National River last week, officials said.

The search for Clinton "Preston" Smith, 67, entered its third day Monday along the Hemmed-in-Hollow Trail in Newton County, the National Park Service (NPS) said.

Bloodhounds were deployed on Saturday, but rainy conditions in the afternoon temporarily stalled the search.

Officials said no further volunteers are needed at this time.

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clinton preston smith

Clinton "Preston" Smith, 67, is missing after he failed to return from a hike on the Hemmed-in-Hollow Trail in Buffalo National River, Newton County, Arkansas, on Friday. (National Park Service)

Smith, from Baton Rouge, Louisiana, was last seen wearing blue jeans and a black shirt.

Authorities asked anyone with information on Smith’s whereabouts to contact Buffalo National River’s emergency dispatch personnel at 888-692-1162.

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Buffalo National River is America’s first national river and is one of the few remaining undammed rivers in the lower 48 states, according to the NPS.