Lower Brisbane River Catchment and Estuary
|  | | | | Catchment Facts |
| | - Total area: 1,195km2
- Stream network length: 2,475km
- Local Councils: Brisbane City Council, Logan City Council, Scenic Rim Council
- Dominant land uses: urban, native bush, grazing, rural residential
- Highly modified, urbanised catchment
- Some grazing lands and natural bush/forested areas remain in the upper parts of the catchment
- Riparian vegetation has been cleared from most waterways
- Large volume of stormwater runoff into the waterways during/after storm events
- Population growth is a major pressure on the catchment
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| | | Freshwater results |
| | | F | | Lower Brisbane Catchment |
| | | - Streams in poor condition.
- Declines in the Nutrient Cycling, Aquatic Macroinvertebrates and Physical/Chemical indicators.
- Improvement in the Fish indicator across both seasons, slight improvement in Ecosystem Processes.
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| | | Estuarine results |
| | | D+ | | Brisbane Estuary |
| | | - Decreases in dissolved oxygen, turbidity and biological health rating with slightly higher sewage nitrogen signals detected.
- Lower phytoplankton abundance.
- Salinity throughout estuary lowest since 2001, indicative of high freshwater inputs.
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| D | | Cabbage Tree Estuary |
| | | - Increases in phytoplankton abundance and nitrogen concentrations at most sites.
- Continued elevated phosphorus at all sites.
- Continued low dissolved oxygen.
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