NYC Resources311Office of the Mayor

Channel Morphology and Instream Habitat

Pebble Counts

2004, 2005

Pebble counts were used to determine bed particle size distribution as part of the anadromous fish reintroduction feasibility study. These pebble counts were used to determine where suitable spawning grounds exist in the Bronx River.

Pebble count locations:

Methods

Grains were selected by reaching down and picking up the first grain touched. Diameter was measured for the average dimension and recorded.

Bed Particle Size Distributions

Drew Gardens

Drew Garden Pebble Count Summary
Median particle size = 92.92 mm

Tremont Avenue & 180th Street

Tremont Avenue Pebble Count Summary
Median particle size = 130 mm

Beneath 181st Street

181st St Pebble Count Summary
Median particle size = 55.29 mm

River Park

River Park Pebble Count Summary
Median particle size = 91.65

Shoelace Park

Shoelace Park Pebble Count Summary
Median particle size = 91.65 mm

 Download Pebble Count data (Excel file, 3.4MB)

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