If the front entrance is closed due to weather, you will need to enter through the Alternate Entrance. The creek can get high enough to not allow passage into the park, so the main gate will be closed, but the alternate entrance is open. The alternate entrance is through the French Creek Subdivision.
From Loop 1604, go past Braun Rd to the next red light and turn left. From Loop 410, it is the light prior to Braun Rd, turn right. Turn left at the first street, Hetherington Rd. This street will go directly into OP Schnabel Park. Follow the road to the NSLL entrance.