Tim Maassen (DOT# 1126016) – FMCSA Carrier Profile
doing business as WEST ROCK CONSTRUCTION INC
DOT# 1126016● Active
Updated: 2026-03-09
Tim Maassen is a registered motor carrier with the FMCSA under USDOT number 1126016. The company operates from Rock Valley, IA and maintains an active operating status with 9 power units and 7 drivers on record.
Safety Rating
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Company Information
Address1995 350th Street, Rock Valley, IA, 51247
Phone(712) 982-2007
Entity TypePrivate Property
OperationInterstate
Power Units9
Drivers7
MCS-150 FiledJune 26, 2025
Annual Mileage10,000 mi (2025)
Inspection Summary
All-time Inspections
All-time4
Total
15
OOS
1
Driver OOS
14
Vehicle OOS
The out-of-service (OOS) rate represents the percentage of inspections that resulted in the carrier being placed out of service.
BASICS Safety Scores
BASICS Scores
Higher = more risk · FMCSA Behavior Analysis and Safety Improvement Categories0.4
Unsafe Driving
0.0
HOS Compliance
3.5
Driver Fitness
0.0
Controlled Substances
23.7
Vehicle Maintenance
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Frequently Asked Questions
What is USDOT Number 1126016?
USDOT number 1126016 is assigned to Tim Maassen, an active motor carrier registered with the FMCSA, based in Rock Valley, IA.
How many inspections has Tim Maassen had?
Tim Maassen has recorded 4 total inspections with 15 out-of-service orders, representing an OOS rate of 375.00%.
Where is Tim Maassen located?
Tim Maassen is headquartered at 1995 350th Street, Rock Valley, IA 51247.
Data sourced from the FMCSA Open Data Portal. Updated monthly. DOT# 1126016 · Last updated: 2026-03-09. View official FMCSA record →