Also, the harbor was surrounded by easily defended seawalls. May and June Tide charts for Inch'on: The tide charts below show the height, time and date of high and low tides for the next 30 days. In presenting his plan, Operation Chromite, MacArthur cited these factors as reasons the NKPA would not anticipate an attack at Inchon. Next high Spring Tide at Inch'on will be on Sun 07 Jun (height:9.36m 30.7ft). Surubachi on Iwo, where the tides were far more severe than Tarawa, and the narrow approaches made the harbor a potential trap. Many were initially skeptical of MacArthur's plan as Inchon's harbor possessed a narrow approach channel, strong current, and wildly fluctuating tides. Remember, the assaulting forces had never trained together for any combined operation, let alone one so complex as Inchon, where the prominence on Wolmi-do loomed like Mt. Tide Times are KST (UTC +9.0hrs). The second waves of Marines hit north and south of Inchon’s inner harbor at 5:33 p.m. and at 5:32 p.m., respectively. Tides Today & Tomorrow; Monthly Tide Charts; Weather Forecasts; Doppler Radar; Wind; Marine Weather; NOAA Charts; Fishing & Boating | 1,300+ Harbors in the US. Last Spring High Tide at Inch'on was on Mon 25 May (height:8.92m 29.3ft).