Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$575,845$163 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 91How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026

170 MONAHAN RD

CASTLE ROCK, WA 98611
4
Beds
2
Baths
3,537 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
5.5 ac
Lot SizeThe size of the land the home sits on, from county records.
1977
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$576K
$524K low$627K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,762 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$687,930 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$5,310
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$682,620
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$690,680
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$701,790

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.197 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyCOWLITZ
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Heat Pump
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 344 ft²

Transaction History(2)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

H
Castle Rock High SchoolC-
High · Grades 9–12 · 3.1 mi
M
Castle Rock Middle SchoolD-
Middle · Grades 6–8 · 3.3 mi
E
Castle Rock Elementary SchoolD+
Elementary · Grades PK–5 · 3.4 mi

District: Castle Rock School District

Neighborhood · ZIP 98611These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.85
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.172

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.12%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.10,313
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.84 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$81,330
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$96,543
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.61 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.35%

Owner Tools

Do you own this home?
Claim this home

Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

170 Monahan Rd measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth more than 82% of homes in Cowlitz County
  • Costs less per square foot than 98% of homes in Castle Rock 98611
  • Bigger than 98% of homes in Castle Rock 98611
  • Has a bigger lot than 91% of homes in Cowlitz County

What homes are worth in Castle Rock 98611

Each bar is how many homes fall in that price range. The marker is this home.

This home
$236K$936K

This home is worth more than 70% of homes in Castle Rock 98611.

How it measures up in Castle Rock 98611

The dot is this home. The mark in the middle is the typical home in Castle Rock 98611.

Estimated value$575,845
CheaperTypical $470,740Pricier

Pricier than 70% of homes nearby

Price per ft²$163
CheaperTypical $291Pricier

Pricier than 2% of homes nearby

Living area3,537 ft²
SmallerTypical 1,593 ft²Bigger

Bigger than 98% of homes nearby

Lot size5.5 ac
SmallerTypical 2.44 acBigger

Bigger than 80% of homes nearby

Year built1977
OlderTypical 1980Newer

Newer than 45% of homes nearby

How 170 Monahan Rd ranks against every home in each area.
MeasureThis homeCastle Rock 98611Cowlitz County
Estimated valuepricier than$575,84570% of homes82% of homes
Price per ft²pricier than$1632% of homes2% of homes
Living areabigger than3,537 ft²98% of homes98% of homes
Lot sizebigger than5.5 ac80% of homes91% of homes
Year builtnewer than197745% of homes53% of homes

About 170 Monahan Rd

How much is 170 Monahan Rd, Castle Rock, WA worth?

The TopHap Estimate for 170 Monahan Rd, Castle Rock, WA is $575,845 as of Oct 21, 2026. The likely range is $524,332 to $627,358. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 170 Monahan Rd, Castle Rock, WA last sell?

170 Monahan Rd, Castle Rock, WA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 170 Monahan Rd, Castle Rock, WA?

170 Monahan Rd, Castle Rock, WA has 4 bedrooms, 2 bathrooms and 3,537 square feet of living space.

When was 170 Monahan Rd, Castle Rock, WA built?

170 Monahan Rd, Castle Rock, WA was built in 1977, making it 49 years old. The building has 2 stories.

What schools serve 170 Monahan Rd, Castle Rock, WA?

170 Monahan Rd, Castle Rock, WA is assigned to Castle Rock High School (high), rated C-; Castle Rock Middle School (middle), rated D-; Castle Rock Elementary School (elementary), rated D+. All sit in Castle Rock School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 170 Monahan Rd, Castle Rock, WA compare to other homes in Castle Rock 98611?

Among the 4,409 homes in Castle Rock 98611, it is worth more than 70% of them ($575,845 against a typical $470,740), its price per square foot is higher than 2% of them ($163 against a typical $291), it is bigger than 98% of them (3,537 ft² against a typical 1,593 ft²), its lot is bigger than 80% of them (5.5 ac against a typical 2.44 ac) and it is newer than 45% of them (1977 against a typical 1980). Measured against all of Cowlitz County, it is worth more than 82% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 170 Monahan Rd, Castle Rock, WA?

The 2025 property tax bill for 170 Monahan Rd, Castle Rock, WA was $5,762. The county assessed it at $687,930.

More homes on Monahan Rd

Closest homes

More homes in Castle Rock 98611

Assigned schools

Explore the area

See this home in context

Open 170 Monahan Rd on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map