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What is an IAMP?
A long-term (20+ years) ODOT transportation facility plan for interchanges that is an element of the State Transportation System Plan (TSP).
What is the purpose of an IAMP?
Preserve the long-term function (operations and safety) of the interchange infrastructure (e.g. ramp terminals, crossroads, and crossroad access points).
What are the objectives of an IAMP?
1. Accommodate long-term regional and local traffic demand;
2. Coordinate land use planning with the design or retrofit of the interchange; and
3. Ensure a cooperative planning process between local and state agencies.
What are the typical components of an IAMP?
Evaluating/selecting interchange and local circulation forms;
Identifying local circulation and access to all properties located within at least ¼ mile of ramp terminals;
Developing access management plan along the interchange crossroad;
Developing land use management strategies; and
Developing intergovernmental agreements stipulating future land use review and funding.
These Improvements plan to:
1. Close the current cut-and-cover Bypass connection to OR 62;
2. Physically separate the Bypass from OR 62; and
3. Extend the Bypass further south to connect into the planned Split Diamond Interchange.
As a Result:
1. Congested intersections along OR 62 between the interchange and Delta Waters Road are expected to be alleviated (particularly the OR 62/Bullock Road-Poplar Drive intersection);
2. Some Bypass traffic will still need to access intersections, businesses, services, etc. between the interchange and Delta Waters Road – therefore, this region of the study area is expected to see significant traffic pattern and volume changes; and,
3. The I-5 southbound off-ramp and I-5 northbound on-ramp terminals are expected to be further congested with these system improvements if no localized improvements are made to the intersections.
What Can Be Done To Support These System Improvements?
1. The following pages illustrate how the I-5 Exit 30 IAMP study area is expected to perform in the future with the FEIS in place.
2. The project team is starting to evaluate local improvements at intersections within the study area to improve performance and that can support these system improvements.