Circling Only Approach Criteria

FAF to Rwy is ~2000' in 5.9 miles, or roughtly 330'/nm. This is well within the TERPS 400'/nm limitation. From the IAF to Rwy is only 250'/nm so that is reasonable too. Course is lined up within 30*.

I don't know why. Perhaps the Rwy not having "instrument" markings is the factor. The terrain isn't, otherwise there would be notes regarding the circle or they wouldn't have the approach in the first place.

There are plenty of gravel runways (no markings) that have straight in approaches, so I don't think that would be a factor. It would raise mins, sure, but not preclude a straight in approach.
 
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