The Marikina Watershed Reservation was originally created on the July 26, 1904, by virtue of Executive Order No. 33, which was issued by then Governor-General of the Philippine Islands Luke Edward Wright.
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Further south on the Quezon City side Barangay Pansol is drained by Pansol Creek, with headwaters reaching as far up to just behind the University of the Philippines Integrated School Campus.
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Near the boundary of Marikina and Pasig cities, the river meets the gates of the Manggahan Floodway, a controlled waterway used to prevent flooding in Manila during heavy rains by diverting most of the water of the Marikina towards Laguna de bay instead of Pasig River.
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