Shimen Waterfall is literally a stone gate as the translation suggests. The waterfall is located upstream of Maling Hot Spring. Hikers walk through a deep canyon of near vertical walls next to the still closed Central Cross Island Highway.
How to get there – Drive through Guguan on Highway 8 on the still closed Central Cross Island Highway. Drive 3 km east from Guguan and turn left just before the checkpoint (you can’t go through it) at a 0km marker. Follow this small road < 1km down to a building site. The building site is for dam employees but it seems okay to park here.
Mass transit – There are buses to Guguan but you would likely have to walk the remaining 4km to the river.
This hike is in the riverbed and could be very dangerous during a rainstorm. In addition they do weekly discharges from the dam upstream. I am unsure how high river levels are during the summer/fall but it might be dangerous or inaccessible at that time.
The hike – The road is blocked off with a gate that you will need to climb around. There is a warning sign (in Chinese) so proceed at your own risk (you can ask at the police station below). Walk down the road until you come to a landslide section. Follow this landslide down to the riverbed and then walk 10-15 minutes upstream to Guguan Dam Waterfall and the old entrance (looks like a temple) to the power plant. Maling Hot Spring and Waterfall and Shimen Waterfall are further upstream. You will have to cross the river many times to get to either of them.
Permits – I found out after my hike that you are supposed to get a police permit in Guguan to hike here. Police permits seem simple enough to get in most cases and they will check if there is a dam discharge on that day. I didn’t do this but will check on my next trip.
Date visited – 3/5/2017
Nearby waterfalls – Hudie (Butterfly) Valley Waterfall – Guguan Dam Waterfall – Maling Hot Spring and Waterfall – Xiannu Waterfall – Longgu Waterfall – Dongmao River Waterfall – Menghuan Valley Waterfall