The box spring at the William Brien Memorial Shelter is 300 feet south of the shelter at a bearing of 172.8° True. GPS: 41.2789, -74.0591 It can be difficult to find and you could easily trip over it without seeing it. Harriman Hydro Real-Time Stream Flow. The smaller streams in Harriman should be flowing when the Mahwah River discharge rate is greater than 14ft³/s. USGS Mahwah River real-time data. https://waterdata.usgs.gov/monitoring-location/USGS-01387450/#period=P7D&dataTypeId=continuous-00060-0&showMedian=true&showFieldMeasurements=true