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Currently, the aquatic organisms of the Iller cannot migrate into the side water "Buxach". The passability is not given. The estuary area will be flattened to allow the habitats of the Iller and the "Buxach" to connect. The side waters serve the fish as spawning grounds or retreat places in case of flood. The measure is part of the project Agile Iller.

The Arlacher Weir is currently impassable for aquatic organisms such as fish or microorganisms moving along the river bed. Due to local conditions, the construction of a ramp is not possible. The passage is therefore made by a fish ladder. It runs along the bank next to the weir and connects the upper and lower water. Different variants, such as a near-natural bypass channel or a technical fish ladder are being investigated. Structural, hydraulic, ecological and economic criteria are compared for the different variants. The measure is part of the project Agile Iller.

The originally natural gradient of the Iller is largely removed by the transverse structures erected as a result of the straightening of the Iller. This created waterways with a low gradient and the pre-alpine watercourse characteristics were lost.  Through the construction of side arms, an attempt is being made to create an extended watercourse habitat with natural bed layers and high habitat function. It enables an approximation to the natural, branched course of the watercourse with its numerous side channels. The measure is part of the project Agile Iller.

Following 1999 floods, the flood protection dike had to be strenghtened, what also required a relocation of the Gennach. The river development was carried out under consideration of ecological aspects with changing river bed widths and slope inclinations. The right bank was not fortified, so a natural watercourse can develop again through self dynamic processes. This will create diverse habitats for flora and fauna. Access to the river was created for the population. 800 woods were planted as noise and sight protection against the neighboring road B 12. 

The ground threshold is currently impassable for aquatic organisms, such as fish or micro-organisms moving on the ground. By converting the concrete sleepers into shallow ramps, the passability for aquatic organisms is achieved. A sole ramp provides passability over the entire width of the watercourse. The watercourse section is extended and creates new valuable habitat. The aim of the measure is to achieve good ecological status or, in the case of heavily modified water bodies, good ecological potential in accordance with the Water Resources Act (§ 27 WHG).

The Mooshauser Schwelle at the Iller is currently impassable for aquatic organisms such as fish or microorganisms moving along the river bed. Due to local conditions, the construction of a ramp is not possible. The passage is therefore made by a fish ladder. It runs along the bank next to the weir and connects the upper and lower water. Different variants, such as a near-natural bypass channel or a technical fish ladder are being investigated. Structural, hydraulic, ecological and economic criteria are compared for the different variants. The measure is part of the project Agile Iller.

Fish migration at the Attel at Aiterndorf is limited by a 2 meter high drop structure. In order to improve fish migration the water authority Rosenheim built a bypass channel.

The Gennach has been highly regulated in the area of Highschool in Buchloe. In course of the new construction of the High School the municipality of Buchloe was able to make areas on the right bank of the Gennach available for restoration. The bank protection was removed and the original course of the Gennach was restored. Structural elements (e.g. deadwood or rootstocks) were implemented. Today the Gennach in this area has enough space for a self dynamic development. 

The water authority Rosenheim improved the ecological status of the Attel by creating a meandering riverbed with altering waterbody widths and slope angles. Furthermore the riverbed has been widened. 

The ground thresholds Oberopfingen is currently impassable for aquatic organisms, such as fish or micro-organisms moving on the ground. By converting the concrete sleepers into shallow ramps, the passability for aquatic organisms is achieved. A sole ramp provides passability over the entire width of the watercourse. The watercourse section is extended and creates new valuable habitat. Above the rough ramp, the ecological development of the watercourse is to be promoted.