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Elkhorn Creek

(River/Stream Floodplain Scale, All Risk Indicators Report)

July 2025

Cumulative Flood Risk Score

83.8% Very High

Ranks 26th of 156 river/stream floodplains in the state

  • 0 of 8 risk indicators among the top 10% river/stream floodplains.
  • 4 of 8 risk indicators among the top 20% river/stream floodplains.
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Noteworthy Flood Risk Facts for Elkhorn Creek

Table 1. Noteworthy Flood Risk Facts: A Cumulative Flood Risk Index of 8 flood factors reveals that Elkhorn Creek ranks 26th of 156 river/stream floodplains in the state with a Cumulative Flood Risk Score of 83.8%. Below are all 8 flood risk indicators used in the risk index. Click on the More Info link for rationale and recommendations of each indicator.

Risk Indicator Description More
Info
Supplementary External Links
Floodplain Length 23.6 miles of high-risk floodplain. Click for more information.
Flood Depth Median 3.2 feet median base flood depth. Click for more information.
Building Floodplain Count 448 buildings in a high-risk flood zone. Click for more information. Building Count in SFHA by River/Stream Building Count in SFHA by River/Stream (Percent Rank Classification) Highest Substantial Damage Estimates for Top
Building Floodway Count 101 buildings in the regulatory floodway or main river channel. Click for more information. Floodway Building Count by River / Stream Floodway Building Count by River / Stream (Percent Rank)
Building Density 18.99 buildings/mile density in floodplain. Click for more information. Building Density by Stream Length Building Density by Stream Length (Percent Rank Classification)
Building Median Value $14,650 median building value in floodplain. Click for more information.
Bldg. Substantial Damage Count 49 bldgs. substantially damaged by a 1% annual chance (100-yr) flood. Click for more information. Building Substantial Damage Count by Stream (1% Flood) Building Substantial Damage Count by Stream (1% Flood) (Percent Rank) Building Substantial Damage Estimates: Top 100 Streams (1% Flood)
Bldg. Substantial Damage Ratio 10.9% of buildings in floodplain substantially damaged by major storm. Click for more information.
Cumulative Index 83.8% cumulative risk index score. Click for more information.

Flood Risk Index Scores for Elkhorn Creek

Table 2. Flood Risk Index Scores: A Cumulative Flood Risk Index of 8 flood factors reveals that Elkhorn Creek ranks 26th of 156 river/stream floodplains in the state with a Cumulative Flood Risk Score of 83.8%. Below are all 8 flood risk indicators used in the risk index with the indicator scores and rankings.

Category Flood Risk Indicator Value for Elkhorn Creek Indicator Score
(0 - 100%)
Indicator Rating
Floodplain Characteristics Floodplain Length Click for more information. 23.6 Miles 60.0% Relatively High
Flood Depth Median Click for more information. 3.2 Ft 89.0% Very High
Floodplain Characteristics Index, 26th 83.2% Very High
Building Exposure Building Floodplain Count Click for more information. 448 80.6% Very High
Building Floodway Count Click for more information. 101 84.5% Very High
Building Density Click for more information. 18.99 /Mile 65.8% Relatively High
Building Exposure Index, 18th 89.0% Very High
Building Characteristics Building Median Value Click for more information. $14,650 4.5% Very Low
Building Characteristics Index, 149th 4.5% Very Low
Building Damage Loss Bldg. Substantial Damage Count Click for more information. 49 81.2% Very High
Bldg. Substantial Damage Ratio Click for more information. 10.9% 76.7% Relatively High
Building Damage Loss Index, 32nd 80.0% Very High
Risk Index Cumulative Index Click for more information. 83.8% Very High

Risk Index Legend

Color for the 'VERY HIGH' rating VERY HIGH: 90% - 100%
Color for the 'Very High' rating Very High: 80% - 100%
Color for the 'Relatively High' rating Relatively High: 60% - 79.9%
Color for the 'Moderate' rating Moderate: 40% - 59.9%
Color for the 'Relatively Low' rating Relatively Low: 20% - 39.9%
Color for the 'Very Low' rating Very Low: 0% - 19.9%

Flood Risk Indicators of Elkhorn Creek Compared to Other River/Stream Floodplains

Table 3. Flood Risk Index Comparison: Flood risk indicator values for Elkhorn Creek compared to descriptive statistics of all river/stream floodplains.

Category Flood Risk Indicator Value for Elkhorn Creek Median Value Mean Value Min Value Max Value State Stats
Floodplain Characteristics Floodplain Length Click for more information. 23.6 Miles 18.1 Miles 38.0 Miles 0.5 Miles 438.0 Miles 17,205.1 Miles
Flood Depth Median Click for more information. 3.2 Ft 1.1 Ft 1.5 Ft 0.0 Ft 10.4 Ft 1.8 Ft
Building Exposure Building Floodplain Count Click for more information. 448 173 369 4 6,920 82,408
Building Floodway Count Click for more information. 101 15 51 0 632 8,237
Building Density Click for more information. 18.99 /Mile 12.98 /Mile 17.83 /Mile 1.04 /Mile 210.26 /Mile 0.16 /Mile
Building Characteristics Building Median Value Click for more information. $14,650 $34,850 $41,061 $10,000 $247,700 $38,200
Building Damage Loss Bldg. Substantial Damage Count Click for more information. 49 7 35 0 918 6,493
Bldg. Substantial Damage Ratio Click for more information. 10.9% 4.1% 7.4% 0.0% 65.2% 7.9%


Risk Indicator data last updated August 2024