TIM MAASSEN
USDOT 1126016 • DBA: WEST ROCK CONSTRUCTION INC • 3616 CHESTNUT AVE, ROCK VALLEY, IA, 51247
ACTIVE
Authority:None on file
Insurance:None on file
BOC-3:Not on file
Safety Rating:Not rated
MCS-150:Never updated
OOS Orders:None
Overview
Company profile from FMCSA Census File
USDOT
1,126,016
Status
ACTIVE
Operation
Interstate
State
Phone
7129822007
Email
Power Units (MCS-150)
9
Drivers (MCS-150)
7
MCS-150 Mileage
10,000
Physical Address
3616 CHESTNUT AVE, ROCK VALLEY, IA, 51247
Contact
Phone: 7129822007
Email: [email protected]
Risk Signals2 flagged
MEDIUM
Elevated vehicle OOS rate: 100.0%
National average is 23.4%. This carrier's vehicle OOS rate is 76.6 percentage points above average.
MEDIUM
Elevated driver OOS rate: 20.0%
National average is 6.7%. This carrier's driver OOS rate is 13.3 percentage points above average.
Signals are auto-detected from FMCSA public records. This is not a regulatory determination.
Authority & Insurance
Operating authority, insurance filings, and BOC-3 status
Active Authority
0
Revoked / Inactive
0
Authority Types
0
Insurance Policies
None on file
BOC-3 Filing
Not on file
Operating Authority
fmcsa-authhistApr 5, 2026
No records found
No insurance filings found for this carrier in FMCSA records.
Safety & Inspections
SMS BASIC scores, inspection history, and out-of-service rates
SMS BASIC Scores
Driver Fitness
51%
Hours of Service
N/A
Higher percentile = worse safety performance relative to peers. Scores at or above 75% trigger FMCSA alerts.
Inspections
5
Violations
40
16 OOS
Vehicle OOS %
100.0%
Above nat'l avg (23.4%)
Driver OOS %
20.0%
Above nat'l avg (6.7%)
Power Units (MCS-150)
9
Drivers (MCS-150)
7
Crash Records
0
Inspection Activity (24 months)
Monthly inspection counts with OOS months highlighted. Hover bars for details.
May
Jun
Jul
Aug
Sep
2
Oct
Nov
Dec
1
Jan
Feb
Mar
Apr
May
Jun
Jul
1
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Clean monthMonth with OOSBased on latest 5 of 5 inspection records
Inspection Activity Map
2 states • 5 inspections
None Low Medium High🚛 Home base
Violation Summary (40 violations from 5 inspections)
fmcsa-inspection-file
| Code | Description | # Violations | # OOS | Severity Wt | BASIC |
|---|---|---|---|---|---|
| FMCSR:393.48A-BIHE | Inoperative/defective brakes | 4 | 0 | 8 | Vehicle Maintenance |
| FMCSR:393.9TS | Inoperative turn signal | 3 | 3 | — | Vehicle Maintenance |
| FMCSR:396.17C-PI | No proof of periodic inspection | 2 | 0 | 3 | Vehicle Maintenance |
| FMCSR:393.100B-C | Cargo securement - aggregate working load | 2 | 2 | 6 | Vehicle Maintenance |
| FMCSR:393.9T | Inoperable tail lamp | 2 | 1 | — | Vehicle Maintenance |
| FMCSR:393.9 | Inoperable Required Lamp | 2 | 1 | — | Vehicle Maintenance |
| FMCSR:396.17C | No proof of periodic inspection | 2 | 0 | 3 | Vehicle Maintenance |
| FMCSR:392.2RG | Operating a CMV while ill or fatigued | 2 | 0 | 8 | Unsafe Driving |
| FMCSR:396.17(c) | No proof of periodic inspection | 2 | 0 | 3 | Vehicle Maintenance |
| FMCSR:391.11B1-A | Age - Operate a CMV while not at least 21 years of age in interstate commerce | 1 | 1 | — | Driver Fitness |
| FMCSR:391.41A-MCPC | Physical qualification - general | 1 | 0 | 7 | Driver Fitness |
| FMCSR:393.95F | Emergency Equipment - Stopped vehicle warning devices missing or improper | 1 | 0 | — | Vehicle Maintenance |
| FMCSR:393.95A1 | Emergency Equipment - Fire Extinguishers - no fire extinguisher present or not properly rated. | 1 | 0 | — | Vehicle Maintenance |
| FMCSR:393.23-LEU | Lighting - All electrical systems on towed vehicle(s) inoperative due to no electrical connection (e.g. unplugged or loose pigtail) | 1 | 1 | — | Vehicle Maintenance |
| FMCSR:396.3A1-BOS | BRAKES OUT OF SERVICE: The number of defective brakes is equal to or greater than 20 percent of the service brakes on the vehicle or combination | 1 | 1 | — | Vehicle Maintenance |
| FMCSR:393.43D | Brake - relay emergency valve | 1 | 1 | 7 | Vehicle Maintenance |
| FMCSR:393.48A | Inoperative/defective brakes | 1 | 0 | 8 | Vehicle Maintenance |
| FMCSR:396.3A1BOS | BRAKES OUT OF SERVICE: The number of defective brakes is equal to or greater than 20 percent of the service brakes on the vehicle or combination | 1 | 1 | — | Vehicle Maintenance |
| FMCSR:393.60C | Glazing/window obstructions | 1 | 0 | 4 | Vehicle Maintenance |
| FMCSR:393.95A | Emergency equipment - fire extinguisher missing/defective | 1 | 0 | 5 | Vehicle Maintenance |
| FMCSR:392.2-SLLS2 | Speeding 6-10 mph over limit | 1 | 0 | 5 | Unsafe Driving |
| FMCSR:393.130 | Cargo securement - heavy equipment | 1 | 1 | 7 | Vehicle Maintenance |
| FMCSR:393.60D | Glazing/window obstructions | 1 | 0 | 4 | Vehicle Maintenance |
| FMCSR:393.9A-LSLIWR | Inoperable required lamps | 1 | 1 | 3 | Vehicle Maintenance |
| FMCSR:393.70D | Coupling devices defective | 1 | 1 | 8 | Vehicle Maintenance |
| FMCSR:393.95(a) | Emergency equipment - fire extinguisher missing/defective | 1 | 0 | 5 | Vehicle Maintenance |
| FMCSR:393.9(a) | Inoperable required lamps | 1 | 0 | 3 | Vehicle Maintenance |
| FMCSR:393.43(d) | Brake - relay emergency valve | 1 | 1 | 7 | Vehicle Maintenance |
Peer Context
This carrier vs national averages. Lower is better for all metrics.
Vehicle OOS Rate
100.0%vs nat'l 23.4%
+76.6 pts above avg
Driver OOS Rate
20.0%vs nat'l 6.7%
+13.3 pts above avg
Violations / Inspection
8.00vs nat'l 1.80
+6.20 above avg
National averages: vehicle OOS 23.4%, driver OOS 6.7%, violations per inspection ~1.8. Based on FMCSA MCSAP program data.
Inspection History (5 inspections)
fmcsa-inspectionsApr 5, 2026
| Date | Report # | Station | State | Level | Vehicle | Violations | Top Codes | OOS |
|---|---|---|---|---|---|---|---|---|
| Aug 21, 2025 | 85556611 | Roadside | NE | Level 1 | FORD STRAIGHT TRUCK | 13 | 393.48A-BIHE, 396.17C-PI, 391.11B1-A | Yes |
| Jan 9, 2025 | 83576643 | Roadside | IA | Level 1 | FORD STRAIGHT TRUCK | 15 | 393.9, 393.9TS, 396.17C | Yes |
| Oct 31, 2024 | 83073100 | Roadside | IA | Level 2 | BWSE SEMI-TRAILER | 2 | 392.2-SLLS2, 393.130 | Yes |
| Oct 24, 2024 | 83002058 | Roadside | IA | Level 2 | VINTAGE FULL TRAILER | 5 | 393.60D, 393.9A-LSLIWR, 393.9TS | Yes |
| Jul 18, 2023 | 79221594 | Roadside | IA | Level 2 | RAM STRAIGHT TRUCK | 5 | 396.17(c), 393.95(a), 393.9(a) | Yes |
Inspection analytics
Monthly cadence, frequent stations, and violation mix
Inspections per month (24 mo)
4 total · 100.0% OOS
2024-102025-08
InspectionsOOS
Violations by BASIC category
Related Records
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CityEntities in ROCK VALLEY, IA
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Crashes0 crash records
FMCSA Crash File
Inspections5 inspection records
Full inspection history
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Data sources & freshness
FMCSA Company Census File
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Updated 1 weeks ago
FMCSA Authority History
Updated 1 weeks ago
FMCSA Insurance Filings
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FMCSA Vehicle Inspection File
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Refresh dataLast updated: Apr 5, 2026