These are located on the South side of the river next to Newcastle University Boat Club Boathouse. Most likely used to store demolition charges for thebridge as part of the Tyne Demolition line.
You may also like
Latitude / Longitude: 54.96622732, -1.71912432, Easting / Northing: 418081, 563547, OS Grid Reference: NZ 18081 63547, What3Words: ///twice.appear.care
This is located just North of the railway bridge over the road next to the Boatside pub in Warden near Hexham.