Reach Salem and then it is 22 km uphill. Regular interval buses are available from salem central bus stand. Pay 22/- per person and just alight before the last bus stop at yercaud, near the lake most of the hotels are nearby from the lake. While returning better to get the buses from the starting stop at yercaud rather than the lake side stop as it is not easy to stand in the bus on the hilly road.
By car
There are good roads connecting Yercaud to various places in South via. Salem.It is 358 km from Chennai via. Tindivanam222 km from Bangalore via. Hosur - Krishnagiri - Dharmapuri - Salem - Yercaud . It will take approx 5hrs to drive. One day trip is sufficient from Bangalore. Start early morning reach yercaud around 9 am , spend the whole day and start from yercuad around 4pm. It is enough. Only thing is you will not be able to see the falls as it will take time trek.
190 km from Coimbatore via. Avinashi163 km from Trichy via. Namakkal271 km from Madurai via. Karur80 km from Mettur via. Toppur