Linn County engineer reports bridge-condition declines; timber-bridge plan and five-year program coming

Linn County Engineer Brad Kettles told the Board of Supervisors on Jan. 14 that the county’s most recent bridge inspections showed about 70 of 256 county bridges moved from "good" to "fair," and that the county will prioritize preservation and replacements in its upcoming five-year construction program.

"Our goal is to have less than 5% of our bridges in poor condition," Kettles said, noting the county’s inspections arrive every other year and that the latest round of ratings arrived last week. He said bridge condition ratings reflect separate scores for the deck, superstructure and substructure and that a numeric scale (0–10) is used to classify bridges.

Why this matters: bridge condition influences safety, maintenance costs and eligibility for state and federal funding. Kettles said the county will use the inspection reports to prioritize repairs, preservation and replacements in the 5-year construction program scheduled for presentation in mid‑February.

Kettles described the county’s approach as preservation-first where feasible. Routine measures by county crews — such as rip-rap and targeted repairs — can in some cases restore a bridge’s rating if a single element (for example, a piling) is failing. For bridges that enter the lower-rating categories, the county will evaluate whether targeted repairs or full replacement is required.

Kettles also raised timber-bridge planning. Linn County has about 20 timber bridges, many built decades ago; timber components typically last roughly 50 years and lead times and cost for replacement-grade timber have risen. He said the county will issue an RFP to identify sustainable solutions that allow county crews to build some components in-house and use contractors for installation. He said the county currently builds one or two timber bridges a year and is studying options to improve efficiency.

A separate preservation discussion focused on an older ornamental bridge behind the Gene Ochsley Linn County Public Service Center that resembles the Bertram bridge by design and age. Board members and Kettles said they have discussed options with local jurisdictions and the regional MPO; possibilities include relocation, interpretive signage or integrating preservation into adjacent development plans, but no decision or funding source was identified.

Other pavement and road items Kettles reported: - Pavement KPI: County hard-surface roads are monitored on a 0–100 condition index; the county’s goal is 70 or greater. The Iowa Department of Transportation supplies the underlying data, now on a four-year cycle. - Rock roads: The county recently completed a first-of-its-kind mapping of rock-road conditions using a roller with sensors; staff are evaluating how to use the dataset. - First response KPI: The county measures response to constituent road-related complaints with a 24-hour acknowledgement goal and a 90% target; Kettles said the department is close to that goal. - Lone Tree Road (overlay): Scheduled for overlay next year; Kettles said the work will include a one-time chloride application. - Bloomsbury Farm traffic and dust: Board members raised constituent concerns about increased commercial traffic on a rural road; Kettles said the county will monitor and implement overlay and dust-control measures as appropriate and continue communication with Google about mapping routing where feasible.

Project updates and budget notes included: culvert work near Morgan Bridge Road and Angle Road nearing completion; Ellis Road guardrail replacement funded in part by a $400,000 Traffic Safety Improvement Program grant shared with Cedar Rapids; a completed timber bridge on Martin Creek Road; rock-contract budget lines of roughly $2.0–2.5 million for spring rock work; and that local-option sales-tax proceeds (about $8 million remaining) are committed to a new county facility rather than FY2026 projects.

Kettles said the department has one equipment-operator vacancy and a longstanding design-technician position that the county is not actively filling. He closed by saying Garrett (county staff referenced by name in discussion) will present bridge prioritization slides when the five-year construction program is reviewed.

Ending: The board set the 5-year construction-plan presentation for mid‑February and asked staff to continue outreach on potential preservation options for the historic bridge referenced in the discussion.