Draft restrictions at the Panama Canal are set to cost it $15m.
This is according to estimates cited by AP, which reported that the economic hit is seen as minor compared to the size of its revenues - $2.5bn in 2018.
A drought related to the El Nino whether phenomenon has lowered water levels in Gatun Lake, causing the canal authority ACP to keep cutting maximum draft levels for vessels.
This mean less cargo being carried and less money being banked in fees.
Carlos Vargas, vice president of environment and water for ACP, has said that Gatun is 1.4 metres below normal.
It has dropped more than 0.2m since early April.
"These low levels in the Panama Canal are the product of four or five months of almost zero precipitation," Vargas told AP.
"It really has been the driest dry season we've had in the history of the canal. The flow of rivers to the lake is down 60%."
The maximum draft for neopanamax ships has been cut to 13.41m, the fourth reduction since the drought began. This compares to about 15.2m in a normal dry season.
Analysts have said aframax tankers will be particularly affected.
The limits affect only the Cocoli and Agua Clara locks, AP said.
A dry season in 2015-2016 cost the canal $40m in revenue.
