A modular decking system includes a plurality of elongated deck members for placement across a subsurface. Each plurality of elongated deck members has a top deck portion, opposed first and second downwardly extending sides having outwardly and laterally extending longitudinal flanges, and a plurality of laterally spaced and longitudinally extending leg members extending downwardly from the top deck portion between the first and second sides. An elongated connector, connecting adjacent first and second deck members of the plurality of deck members, has a horizontal base portion having first and second laterally spaced and upwardly extending sidewalls and an interconnecting wall extending between the first and second sidewalls forming an upwardly opening channel adapted to receive the first and second longitudinal flanges of the first and second deck members, respectively, and forming a longitudinal gutter disposed between the top deck portions of the first and the second deck members.