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Black Hawk County imposes temporary 55 mph limit on paved county roads while engineers study Senate File 378 effects
Summary
Following state action that raises default paved‑road speed limits to 60 mph on July 1, the board approved a temporary 55 mph countywide limit on paved roads pending engineering and traffic studies; the county engineer and sheriff's office said the pause is needed to review signage, sight‑distance and other safety infrastructure.
The Black Hawk County Board of Supervisors on June 30 approved a temporary county resolution keeping paved secondary county roads at 55 mph while county engineers and the sheriff’s office evaluate where a 60 mph posted limit is safe and appropriate under Senate File 378.
"We wanted to pause and have a chance to look at all of our 230 mi of paved county roads before we start putting up 60 mph speed limit signs," County Engineer Kathy Nicholas told the board, describing how speed limits affect sight‑distance requirements, driveway permits, rumble‑strip placement, pavement markings and no‑passing zones.
Nicholas said the county will undertake engineering and traffic investigations — prioritizing segments with safety concerns — and expects the review to take several months. "We'll be coming to you with speed‑limit resolutions for those segments we would like to remain at 55 mph," she said.
Chief Deputy Jason Tronis said the sheriff’s office supports a study to protect public safety and noted that higher posted speeds can increase crash severity: "He does support this...the traffic study...to make sure that all our residents are safe as far as the roads that they travel on." County officials emphasized the public should obey posted limits while signs are updated — enforcement will use posted signage rather than an assumed default.
Board members discussed the practical costs and time needed to adjust signage and related road infrastructure such as rumble strips, and noted some roads likely can convert to 60 mph quickly while other segments will need study. The county will coordinate with the Iowa Department of Transportation where state and county jurisdiction overlap.
The resolution keeps paved county roads at 55 mph temporarily while staff develop a prioritized study list and return to the board with segment‑by‑segment recommendations and cost estimates. The board approved the temporary designation by roll call.
Next steps: County engineering staff will meet internally to identify priority road segments for study and will provide periodic updates to the board; the sheriff’s office will continue to coordinate on enforcement and safety concerns.
