If you are traveling with young children this may not be for you. If the river is too high it could be a problem. Additionally, if the weather is bad you could be facing a flash flood even if the river is not too high.
The water could also be too cold for your comfort level as well. Veteran visitors confirm you could be dealing with all of these issues if you visit in March. In fact, the park could close the Narrows depending on the conditions.
If you do decide to go when the weather is warm you may still want to take wetsuits and a change of footwear. You also need to remember that this hike involves wading up the river. Despite its popularity, you will need to be fit enough to handle it.
These trails are also very popular. The Upper Emerald Pool Trail often suffers from closures due to such natural occurrences as rock falls. The Lower Emerald Pool trail is a favorite because it is both easy to hike and short in length. Additionally, it leads to the bottom of a beautiful waterfall and Lower Emerald Pool.