Portable Dredge Dept 484 has $9K in proposed MSHA penalties and $151 outstanding across 1 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
5
Years on record
1986–2021
Latest incident
Sep 2021
Compliance record
MSHA citations since 2000
53
citations
7
significant & substantial
$8,307
proposed penalties
$6,956
paid to date
84% of proposed penalties paid to date, a $1,351 gap.
citations per 100 inspection hours
ⓘThis rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.
Rate withheld: 460 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Portable Dredge Dept 484 has $9K in proposed MSHA penalties and $151 outstanding across 1 contested dockets.
Penalty disposition
ⓘDifferences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.
$9K
proposed penalties
$7K
current assessed
$7K
paid to date
$151
outstanding
58 assessments are final orders; 1 contested dockets.
Of $3K in penalties contested before the Commission, $2K was upheld in final decisions.
As of the most recent assessment on 2026-04-22.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Violation severity profile
ⓘShares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.
Source: MSHA violations gravity and negligence coding, updated weekly.
When citations were contested
ⓘContesting a citation before the Federal Mine Safety and Health Review Commission is a lawful right. These figures state the public outcomes of that process, from MSHA's Contested Violations file.
1citations taken to the federal commission · 2% of citations on record
Settled
1 · 100%
100%
S&S designation survived the contest
ⓘCounts a Significant & Substantial citation as surviving when a settlement or judge's decision kept the designation, or the contest was dismissed or defaulted so the citation stands as issued. Vacated and withdrawn citations, and settlements that removed the designation, count against.
of 1 decided S&S contests · industry: 79%
44%
Penalty reduction in decided contests
$3K proposed, $2K after decisions · industry: 39%
Source: MSHA Contested Violations file (public record), updated weekly. A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record. Latest contest filed 2012-04-17.
Contested penalties
ⓘA reduction or dismissal at the Commission is a lawful outcome of contesting a proposed penalty. Figures are the proposed amount and the amount upheld in the docket's decision.
Largest penalties this mine contested before the Federal Mine Safety and Health Review Commission, with the outcome on record.
Health sampling
ⓘA sample is a point in time compliance measurement, not an individual exposure history. These figures describe MSHA sampling records and do not establish causation or personal dose.
Metal and nonmetal contaminants (personal samples)
ⓘMany samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.
Last sampled: 2026-04-21
14
samples
0
limit-tested
Most sampled contaminants
Respirable dust, <.1mg8
Unlisted Particulate, total, <1% Qtz3
Unlisted Particulate, respirable, <1% Qtz3
Show the individual readings (14)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2026-04-21
Respirable dust, <.1mg
0
Dredge/Barge Operator
2026-04-21
Respirable dust, <.1mg
0
Washer Operator
2024-04-18
Respirable dust, <.1mg
0
Dredge/Barge Operator
2024-04-18
Respirable dust, <.1mg
0
Utility Man
2022-10-05
Unlisted Particulate, total, <1% Qtz
0.28
Washer Operator
2020-10-07
Unlisted Particulate, total, <1% Qtz
0.45
Dredge/Barge Operator
2020-10-07
Respirable dust, <.1mg
0
Washer Operator
2020-10-07
Unlisted Particulate, total, <1% Qtz
1.41
Washer Operator
2012-10-02
Unlisted Particulate, respirable, <1% Qtz
0.29
Washer Operator
2012-10-02
Respirable dust, <.1mg
0
Dredge/Barge Operator
2010-04-27
Respirable dust, <.1mg
0
Dredge/Barge Operator
2010-04-27
Unlisted Particulate, respirable, <1% Qtz
0.22
Washer Operator
2004-04-21
Respirable dust, <.1mg
0
Dredge/Barge Operator
2004-04-21
Unlisted Particulate, respirable, <1% Qtz
0.12
Crusher Oper/Worker
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly. Metal/nonmetal contaminant figures come from MSHA's Personal Health Samples and Area Samples files (public record), updated weekly.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
5
2025
4
2024
5
2023
5
2022
5
2021
3
2020
3
2019
2
2018
2
2017
2
2016
2
2015
2
2014
2
2013
2
2012
3
2011
6
2010
3
2009
3
2008
8
2007
4
2006
4
2005
4
2004
4
2003
4
2002
4
2001
4
2000
5
Source: MSHA quarterly employment and production, updated weekly.
Portable Dredge Dept 484 sits in Tama County, Iowa, where the Census mining category is 0.0% of county employment.
Local economic context
ⓘCounty figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.
Tama County, Iowa · Population 16,982
0.0%
Mining share of county employment
$67,955
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
Quarterly safety rates
ⓘCitations per million reported employee-hours. Rates begin in 2000, when MSHA's quarterly employment data starts; earlier incidents are counted but cannot be rate-adjusted. Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
Citations per million employee-hours, as reported to MSHA
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2026 Q2
2,438
1
0
410.2
2026 Q1
669
0
0
0.0
2025 Q4
2,225
0
0
0.0
2025 Q3
1,915
0
0
0.0
2025 Q2
2,750
0
0
0.0
2025 Q1
706
0
0
0.0
2024 Q4
2,316
0
0
0.0
2024 Q3
2,339
0
0
0.0
Show 98 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
3,118
4
1
1282.9
2024 Q1
870
0
0
0.0
2023 Q4
2,688
0
0
0.0
2023 Q3
2,688
0
0
0.0
2023 Q2
2,330
0
0
0.0
2023 Q1
203
0
0
0.0
2022 Q4
1,867
2
0
1071.2
2022 Q3
3,065
0
0
0.0
2022 Q2
2,544
0
0
0.0
2022 Q1
766
0
0
0.0
2021 Q4
1,271
0
0
0.0
2021 Q3
2,656
0
0
0.0
2021 Q2
1,887
0
0
0.0
2021 Q1
557
0
0
0.0
2020 Q4
2,005
3
0
1496.3
2020 Q3
2,153
0
0
0.0
2020 Q2
1,961
1
0
509.9
2020 Q1
171
0
0
0.0
2019 Q4
1,329
0
0
0.0
2019 Q3
1,439
0
0
0.0
2019 Q2
1,433
0
0
0.0
2019 Q1
558
0
0
0.0
2018 Q4
1,147
0
0
0.0
2018 Q3
1,474
0
0
0.0
2018 Q2
1,455
0
0
0.0
2018 Q1
371
0
0
0.0
2017 Q4
1,242
2
0
1610.3
2017 Q3
1,358
0
0
0.0
2017 Q2
1,327
2
1
1507.2
2017 Q1
462
1
0
2164.5
2016 Q4
1,152
0
0
0.0
2016 Q3
1,398
0
0
0.0
2016 Q2
1,130
2
0
1769.9
2016 Q1
847
0
0
0.0
2015 Q4
1,325
0
0
0.0
2015 Q3
1,411
0
0
0.0
2015 Q2
1,402
0
0
0.0
2015 Q1
456
0
0
0.0
2014 Q4
1,160
1
0
862.1
2014 Q3
1,435
0
0
0.0
2014 Q2
1,345
0
0
0.0
2014 Q1
557
0
0
0.0
2013 Q4
1,076
0
0
0.0
2013 Q3
1,388
0
0
0.0
2013 Q2
1,668
0
0
0.0
2013 Q1
561
0
0
0.0
2012 Q4
716
2
0
2793.3
2012 Q3
1,330
0
0
0.0
2012 Q2
1,420
0
0
0.0
2012 Q1
57
0
0
0.0
2011 Q4
1,755
0
0
0.0
2011 Q3
3,167
0
0
0.0
2011 Q2
1,376
1
1
726.7
2011 Q1
1,179
1
0
848.2
2010 Q4
1,719
0
0
0.0
2010 Q3
620
0
0
0.0
2010 Q2
1,326
7
0
5279.0
2010 Q1
935
0
0
0.0
2009 Q4
1,324
1
0
755.3
2009 Q3
849
0
0
0.0
2009 Q2
766
0
0
0.0
2009 Q1
16
0
0
0.0
2008 Q4
796
0
0
0.0
2008 Q3
2,289
0
0
0.0
2008 Q2
937
0
0
0.0
2008 Q1
1,660
0
0
0.0
2007 Q4
1,677
6
2
3577.8
2007 Q3
2,676
0
0
0.0
2007 Q2
3,155
0
0
0.0
2007 Q1
910
0
0
0.0
2006 Q4
2,025
0
0
0.0
2006 Q3
3,475
0
0
0.0
2006 Q2
3,800
0
0
0.0
2006 Q1
1,000
0
0
0.0
2005 Q4
2,050
1
0
487.8
2005 Q3
3,100
0
0
0.0
2005 Q2
3,200
2
2
625.0
2005 Q1
1,040
0
0
0.0
2004 Q4
2,090
0
0
0.0
2004 Q3
3,120
0
0
0.0
2004 Q2
3,280
3
0
914.6
2004 Q1
1,000
0
0
0.0
2003 Q4
2,160
0
0
0.0
2003 Q3
3,295
0
0
0.0
2003 Q2
3,060
0
0
0.0
2003 Q1
1,040
0
0
0.0
2002 Q4
2,240
0
0
0.0
2002 Q3
3,060
1
0
326.8
2002 Q2
3,060
2
0
653.6
2002 Q1
1,040
0
0
0.0
2001 Q4
2,005
0
0
0.0
2001 Q3
1,575
0
0
0.0
2001 Q2
3,060
5
0
1634.0
2001 Q1
1,040
0
0
0.0
2000 Q4
2,325
0
0
0.0
2000 Q3
3,060
0
0
0.0
2000 Q2
2,760
2
0
724.6
2000 Q1
654
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
5 on file
2021 · 1 incident
September 22, 2021IA · Metal/Non-Metalbarge/boat/dredge/towbarge/towboat/leach operator, riverman, deck handHANDLING OF MATERIALS
June 6, 2011IA · Metal/Non-Metalbarge/boat/dredge/towbarge/towboat/leach operator, riverman, deck handMACHINERY
Manatts Inc. · Struck by... (Not Elsewhere Classified)
Dredge pipeline was plugged, EE turned on the booster pump to clear the line. The EE was standing next to the plastic pipeline when it came apart. The pipeline hit the EE slamming him into the I-Beam on the booster framework. The EE had his leg broken in 3 places and his ankle bone was crushed.
EE WAS USING AN ANGLE IRON TO BRACE THE PLATE OF STEEL IN THE BOTTOM PAN ON THE SAND SCREEN. HE THEN TOOK A JACK AND BLOCK AND STARTED JACKING. THE ANGL IRON POPPED OFF AND HIT THE EE IN THE M OUTH, CUTTING HIS LIP AND BREAKING HIS FRONT TEETH ON HIS BRIDGE.
1996 · 1 incident
November 15, 1996IA · Metal/Non-Metalmine manager, mine foreman, mine ownerMACHINERY
Manatts Inc. · Struck by... (Not Elsewhere Classified)
EE WAS USING AN AIR WRENCH TO REMOVE A PLOW BOLTFROM THE DREDGE DURING MAINTENANCE. THE BOLT SLIPPED, SPINNING CUTTING EE'S LEFT INDEX FINGER.
Manatts Inc. · Caught in, under or between running or meshing objects
WHEN CLEANING A9EA AROUND SHAFT, GLOVE CAME IN CONTACT WITH SET SCREW, PULLING HAND INTO ROTATING SHAFT, CAUSING THE ACCIDENT. DAMAGED THE BACK SIDE OF HIS RIGHT HAND.