ScrollRect.normalizedPosition

Description

The scroll position as a Vector2 between (0,0) and (1,1) with (0,0) being the lower left corner.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;  // Required when Using UI elements.

public class ExampleClass : MonoBehaviour
{
    public ScrollRect myScrollRect;
    public Vector2 myPosition = new Vector2(0.5f, 0.5f);

    public void Start()
    {
        //Change the current scroll position.
        myScrollRect.normalizedPosition = myPosition;
    }
}