Iowa DNR
BioNet
River & Stream Biological Monitoring
Fish and Benthic Macroinvertebrate Surveys
Physical Habitat Assessments

Clear Creek Lansing (CCr1)

Fish Session #2535

Sample Date
7/15/2025
Timeframe
0904-0946  
Reach Size
729 ft
Method
Standard Wadeable
Sample Quality
Good
Last Update
2/13/2026 10:26:46 AM

Fish Health

# DELTs
0
# Non-DELTs
0

Equipment

Backpack Shockers
2
Blocknets
0
Property Access Notice

This site is on privately-owned land. The DNR obtains permission from the landowner(s) prior to conducting any sampling surveys.

FIBI Score
30
Warm Water
Fair
Session Comments

BP #1 - 30:18, BP #2 - 29:11

Collected Fish

Identity verification status for this species
Size Class: Typically only collected for sportfish
Taxa excluded from species count metrics.
Click on species name for more information about that species
Species Catch
Brown Trout
Latin: Salmo trutta
Family: Salmonidae
Tolerance: Sensitive
Trophic: Top Carnivore
Is Exotic: True
Is LithoSpawner: False
Is Hybrid: False
308
Rainbow Trout
Latin: Oncorhynchus mykiss
Family: Salmonidae
Tolerance: Sensitive
Trophic: Top Carnivore
Is Exotic: True
Is LithoSpawner: False
Is Hybrid: False
42

FIBI Calculation Factors

Factor Value
Drainage area (mi2) 11.1210
Log(DA) 1.0461
Total Fish 350
Fish per 500 ft 240
Total Species 2
# Excluded Taxa 0
# Exotic Species 2
# LMB-BG 0
Calculation Last Updated 2/13/2026 10:26:46 AM

Fish Index of Biotic Integrity

Metric Name Value Score
Native Species 0 0
Sucker Species 0 0
Sensitive Species 2 3.35
Benthic Invertivore Species 0 0
Top 3 Abundance Percentage 100 0
Benthic Invertivore Percentage 0 0
Omnivore Percentage 0 10
Top Carnivore Percentage 100 10
Lithophilous Spawner Percentage 0 0
Tolerance Index 0 10
Adjusted Catch per Unit Effort 0 0
DELT Percentage Adjustment 0 0

FIBI Score Explained

Sites that score between 26 - 50 are considered fair. Fish abundance ranges from lower than average to very abundant. If fish are abundant, tolerant species are usually dominant. Native fish species usually equal ten or more species. The three most abundant species typically comprise two-thirds or more of the total number of fish. One or more sensitive species, long-lived fish species or benthic habitat specialists such as suckers (Catostomidae) are present. Top carnivore species are often, but not always present in low abundance. Species that are able to utilize a wide range of food items including plant, animal and detritus are usually more common than specialized feeders, such as benthic invertivore fish. Species that require silt-free, rock substrate for spawning or feeding are typically rare or absent. Fish condition is usually good; however, elevated levels of fish exhibiting external anomalies associated with disease or stress are not unusual.

This location has been classified as a Reference Site. Reference sites represent natural stream qualities that are least disturbed by human activities within the watershed. These sites are then grouped by ecoregion to establish a benchmark against which other streams in the same ecoregion are compared.

EcoRegion Comparison

Scores for a sampling session are compared against reference sites within the same ecoregion:

Paleozoic Plateau (Driftless Area)

This site is in the Paleozoic Plateau (Driftless Area) ecoregion.

Ecoregion Map
Max 91
75th Percentile 63
Median 53
25th Percentile 47
Min 9
This Session's Score 30
Total Reference Site Samples 118
Mean 55.41
Standard Deviation 15.95