TODA Gradients
The TODA gradient published in ERSA is the obstacle clear surface extending out from the end of the clearway. The runway code number (CN) determines the length of the surface which is surveyed for obstacles. It's all explained in ERSA/Intro-23. The inner edge width of the take off surface is usually the overall runway strip width. Any runway which does not meet the standard dimensions is qualified with a note following the aerodrome details in the RDS section of ERSA.
The actual location of the critical obstacle should be able to be obtained from the aerodrome operator.