Iowa DNR
Fish Kill DatabaseDB

Fish Kill Event - Bee Branch Detention Basin

City of Dubuque

Event ID
Date of Kill
Waterbody Type
Cause Origin
2 (101 - 1000 fish killed)
Estimated Fish Killed
Investigation Expenses
ESD Field Office
FO 1
Fisheries Office
Manchester Trout Hatchery
Created Date
9/1/2023 8:13:37 AM
Last Update
9/6/2023 9:17:57 AM
For more information about this fish kill event, contact the Field Office or Fisheries Office listed above.
Impacted Assessment Segments
No segments listed
Lat/Long uses WGS84 datum
Onsite Comments

The fish kill occurred in the Bee Branch Detention Basin which is located within the City of Dubuque,T89N, R2E. The UTM to the basin is 692592 East and 4708999 North. The Kill occurred in an approximately 24 acre basin that is open to the Mississippi River via a water outlet structure. The main kill seemed to be located in the SE section of the basin but some fish and mussels were found throughout the basin.

The original spill occurred after a pump was left running while transferring fertilizer from a barge on June 18. An estimated 432,000 gallons of liquid fertilizer overflowed from above ground storage tanks near 1200 Kerper Boulevard.

The kill was extensive but only a percentage of the fish and mussels were tabulated. Many dead fish and mussels could be seen exiting the basin through the outlet structure before being counted and many were consumed by the various scavengers that appeared on site. Water was clear and near base flows at the time of assessment. The kill also included crayfish which were not quantified. It is unknown how long fish were dead in the initial investigation but we were able to identify all the species and some fresh dead fish were observed. The second kill consisted of both older and newly perished individuals but all still remained intact enough to identify to species. Twenty-four species were identified in the kill extent.

Species Number Value
Black Bullhead 1 $1.80
Bluegill 390 $5850.00
Bowfin 2 $0.68
Channel Catfish 4 $60
Common Carp 21 $6.72
Freshwater Drum 2 $1.24
Giant Floater Mussel 181 $79.64
Gizzard shad 1 $0.12
Green Sunfish 3 $1.91
Largemouth Bass 28 $420
Logperch 21 $4.09
Minnows (5 species minus weed shiner) 70 $6.30
Northern Pike 9 $591.00
Pumpkinseed 3 $45
Smallmouth Bass 1 $15
Tadpole Madtom 37 $12.75
Trout Perch 1 $0.09
Walleye 3 $45
Warmouth 2 $30
Weed Shiner 7 $7000
Total Fish and Mussel Value 787 $14,171.34