bubbles of air, a possible sign of tectonic activity. Environment Because of its poor discharge, the Miljacka is known for its peculiar smell and brown waters. Miljacka river cascades, which regulate the waterbed and enrich the water with oxygen, trap plastic scraps, stranded balls, car tires, and various other waste. The main collector that drains fecal matter is parallel to the flow of the river up to its mouth at the river Bosna. The sewer system is not connected to the main collector, causing leakage of fecal matter directly into the waters of the Miljacka in several places. During the Bosnian War, water treatment was stopped and plant equipment was looted, preventing the local government from dealing with the issue. Estimates of the cost to repair the wastewater plant range from 50 to 60 million euros. In April 2015, a project called Čista rijeka Miljacka (Clean river Miljacka) was presented. The aim of the project was to bring the river status to category A, which would make the water clean enough for swimming. In August 2015, the city of Sarajevo signed a contract with ER Project d.o.o. company to clean up 48 river cascades from Šeher-Ćehaja bridge to Dolac Malta suburb bridge. Floods of 2014 The river swelled almost to the level of city bridges during the 2014 Southeast Europe floods, which brought significant flooding to Bosnia and Herzegovina. Floods of 2021 The Miljacka was close to submerging some bridges in Sarajevo during the 2021 Bosnia and Herzegovina floods. Bridges There are over a dozen bridges over the river Miljacka. Some of the better known ones are: Goat's Bridge () Šeher-Ćehaja Bridge Careva ćuprija Latin Bridge (also known as "Principov most", namesake of Archduke Franz Ferdinand's assassin Gavrilo Princip). The assassination carried out by Princip, which led to World War I, took place at the entrance on this bridge. Gavrilo's co-conspirator Nedeljko Čabrinović, another member of the Bosnia-Herzegovinian Mlada Bosna movement, jumped into the river Miljacka from the bridge, seconds after throwing a grenade toward the archduke's car. He intended to hide below the bridge so that he could take and swallow a cyanide powder wrapped into a piece of paper. But the poison got so wet from the fall into the shallow Miljacka (only deep) that it dissolved but lost its toxicity. Čabrinović was dragged alive from the river and arrested. Ćumurija Bridge Drvenija Bridge Čobanija Bridge Festina lente