With a length of 6.9 km (4.3 mi), the road runs south to north, and mostly along the Río Chiquito in barrio Portugués Rural.

In addition most of the road has numerous steep sharp curves and should be driven only with vehicles in top mechanical condition, preferably all-wheel drive sedans, as drivers of SUVs reportedly feel less in control of their vehicles.

At kilometer mark 3.0 km (1.9 mi), PR-504 connects with PR-588 (also known as Camino Pandora or Camino Río Chiquito) heading west towards Sector El Hoyo.

PR-588's northern terminus is at kilometer 7.2 km (4.5 mi) of PR-505 in Barrio Montes Llanos.

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