The point east of Peosta where US 20 angles sharply northeast toward Dubuque has been there since 20 was realigned in Dubuque County in 1959, near where the four-lane road ended at the time. In the decades since, traffic has grown by leaps and bounds and the intersection has become dangerous.
The state has a long-term plan to turn the angle into a more gradual curve, but not all at once. The first part of the plan, scheduled for 2019 (PDF), reshapes the westbound lanes, but keeps an at-grade intersection. The long-term plan (PDF) moves the eastbound lanes to the same curve and builds an interchange with frontage roads, moving part of North Cascade Road farther away from 20. There’s a meeting about the plan tomorrow.