The Goyder Channel, which connects Lake Eyre North and Lake Eyre South, has a length of 15 km and a width varying between 200 and 1 500 m. The bottom elevation of the channel changes after every major event. Allan et al. (1986) note that the sill level has been reduced from -10.1 m ahd (Bonython, 1961), through -10.6 m ahd (Bye et al., 1978), to -11.0 m ahd in 1984.
Flow in the Goyder Channel is a comparatively rare event and has only been recorded recently, in 1974 and 1984. It may have also occurred in 1955.
The Engineering and Water Supply Department established Gauging Station 004510 to measure the flow in the channel. A gauging was carried out on 25 June 1974 to measure the flow discharging into Lake Eyre South from Lake Eyre North. The discharge was 308 m³/s with a mean velocity of 0.831 m/s, for a head difference of 1.28 m between the lakes. Subsequent measurements have demonstrated the impact of wind on flow in the channel. While on 10 August 1974 the flow was 244 m³/s with the strong northerly wind, only four days later barely 83 m³/s flowed through 'The Neck' with a strong southerly wind.