This paper presents the design optimization for reinforced concrete structure done in order to minimize the cost of the concrete and steel for pile by selecting different span length in marine approach jetty, POL berth, Mormugao, Goa. Dimensions of approach jetty is 200 m length × 15 m width. The purpose of the approach jetty is to carry vehicles and oil pipelines. Live load of 30 kN/m2/Class 70R (wheeled) from IRC is considered for the jetty design. The proposed location falls under seismic zone III. Piles are founded in sandstone at a depth of (−)32 m CD. Two options (I and II) were explored for the above considerations, and the feasible alternative has been arrived at cost-effective, robust design, and time-sensitive manner. © 2021, Springer Nature Singapore Pte Ltd.