The Mara is amazing low right now. We estimate the flows at around 1 m3/s at Purungat Bridge (see here for the water level data). The zebra and wildebeest had no trouble crossing the river.
Unfortunately, the low flows are probably contributing to the cholera outbreak in the upper catchment. Read more here - Bomet hotels closed over cholera outbreak and here - Two die of Cholera in Bomet.