This proof-of-concept study proposes an autonomous discharge measurement platform using a combination of thermal and optical imaging in combination with site-specific corrections for surface velocity. Thermal imaging was used for velocity measurement. Under favourable conditions, spectrally-based bathymetric mapping produced good results. For unfavourable conditions (i.e. large, turbid streams), an alternative approach was evaluated based on relationships between depth and length scales of turbulent fluctuations in temperature.