Specifically, a red-spotted newt (Notophthalmus viridescens; Salamandridae), in eft form.
What’s an eft?
Newts have three distinct life stages: larva, juvenile, and adult. The larvae are aquatic. The juveniles are terrestrial and known as efts. The eft stage can last 2 to 7 years in this species. The adults are aquatic or semi-aquatic, depending on species (this one is aquatic).
Red-spotted newts are widespread through the eastern US, particularly in the Appalachians.
This bright-colored creature illustrates aposematism, the characteristic of having bright colors that serve to warn away predators. At all stages the red-spotted newt can excrete poisons (including tetradotoxin) through the skin, but in eft form the animal is particularly potent. Touching one probably won’t kill you, though.
As a rule, the presence of amphibians suggests a reasonably healthy ecosystem. We saw several in Finger Lakes National Forest.
More information here and here.
photographed in Finger Lakes National Forest, New York