ODOT is studying seven different models for tolling, none of which appear to be aimed at reducing congestion in the city center. While tolling on either/both of the interstates that cross the Columbia may have an effect on revenue, it will have a negligible effect on the purpose of congestion pricing and tolling, i.e. reducing congestion where density and transit are most present and where SOV trips need not travel through the city center.
A much more effective method as evidenced by London, Oslo, Stockholm etc. is congestion pricing in the city center. This does not preclude tolling, but it does have an immediate effect on actual vehicle numbers.
Here's a quick vid on
Stockholm.
Here are ODOT's scenarios:
1) Both interstates would be tolled on all lanes in both directions;
2) Both interstates would have one existing lane in each direction converted to a toll lane;
3) Both interstates would have an additional toll lane constructed in each direction;
4) I-5 would have no toll lanes and I-205 would have one additional lane constructed in each direction that would be tolled;
5) I-5 would be tolled on every lane in both directions; no tolls on I-205;
6) I-5 would have one existing lane in both directions converted to a toll lane; I-205 would have all lanes in both directions tolled;
7) I-5 would have one existing lane in both directions converted to a toll lane; I-205 would have a newly constructed toll lane added in both directions.