DBA: West Rock Construction Inc
Tim Maassen is an active interstate carrier based in Rock Valley, IA.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 6 | 0 | 0 |
| Tractors | 3 | 0 | 0 |
| Trailers | 8 | 0 | 0 |
| Total Power Units | 9 | ||
Distinct vehicles · 24 mo
vs 9 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 47% | 82% | Around peer average |
| HOS Compliance | 0% | 0% | Better than most peers |
| Driver Fitness | 97% | 98% | Worse than most peers |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 98% | 99% | Worse than most peers |
Lower percentile = lower SMS measure = stronger safety record. Computed nightly across active carriers in the same state and fleet-size band.
| Type | Inspections | OOS | OOS % | Nat'l Avg |
|---|---|---|---|---|
| Driver | 0 | 1 | — | 6.67% |
| Vehicle | 0 | 14 | — | 22.26% |
| Hazmat | 0 | 0 | — | 4.44% |
Where they run
Inspected in 2 states. Top state IA accounts for 75% of activity.
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| No crashes recorded | 0 | 0 | 0 | 0 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 23 | 7 | 13 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Aug 21, 2025 | NE | STRAIGHT TRUCK | 9 | 4 |
| Jan 9, 2025 | IA | STRAIGHT TRUCK | 10 | 7 |
| Oct 31, 2024 | IA | STRAIGHT TRUCK | 2 | 1 |
| Oct 24, 2024 | IA | STRAIGHT TRUCK |
| Insp w/ Viol |
|---|
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 1 | 0.44 | — |
| HOS Compliance | 0 | 0.00 | — |
| Vehicle Maintenance | 4 | 23.00 | — |
| Driver Fitness | 1 | 2.80 | — |
| Controlled Substances | 0 | 0.00 | — |
| Driver Fitness |
| 2 |
| 0 |
| 1 |
| Unsafe Driving | 1 | 0 | 0 |
| 3 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| Aug 21, 2025 | 39111B1A | Age - Operate a CMV while not at least 21 years of age in interstate commerce | Driver Fitness | Yes |
| Aug 21, 2025 | 39141AMCPC | Medical (Certificate) - Operating a commercial vehicle without showing proof of a valid medical certification upon request when medical certification is required. | Driver Fitness | — |
| Aug 21, 2025 | 393100BC | Cargo - Cargo not secured to prevent leaking/spilling/blowing/falling from CMV | Vehicle Maintenance | Yes |
| Aug 21, 2025 | 39323LEU | Lighting - All electrical systems on towed vehicle(s) inoperative due to no electrical connection (e.g. unplugged or loose pigtail) | Vehicle Maintenance | Yes |
| Aug 21, 2025 | 39348ABIHE | Hydraulic/Electric Brake - Inoperative other than a steering axle. | Vehicle Maintenance | — |
| Aug 21, 2025 | 39395A1 | Emergency Equipment - Fire Extinguishers - no fire extinguisher present or not properly rated. | Vehicle Maintenance | — |
| Aug 21, 2025 | 39395F | Emergency Equipment - Stopped vehicle warning devices missing or improper | Vehicle Maintenance | — |
| Aug 21, 2025 | 39617CPI | Operating a CMV without documentation of a periodic inspection | Vehicle Maintenance | — |
| Aug 21, 2025 | 3963A1BOS | Brake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination | Vehicle Maintenance | Yes |
| Jan 9, 2025 | 393100BC | Cargo - Cargo not secured to prevent leaking/spilling/blowing/falling from CMV | Vehicle Maintenance | Yes |